Bonnie's secret futanari formula

by SabrinaNineteen (ao3)

Chapter 1: The Formula

Marceline floated towards the large window outside Bonnie's bedroom at exactly midnight. The candy kingdom slept as she gently pushed open the large window's frame which creaked noisily. She wondered again why Bonnie had called her at such a strange hour. She had sounded panicked on the phone. 

The vampire queen touched down inside the room silently, noticing PB pacing back and forth at the opposite end of the room. She still wore her lab coat and her long pink had been shortened again, sitting in a simple ponytail on the back of her head. PB was apparently so deep in thought she hadn't even noticed Marceline's arrival, despite the loudly creaking window.

"Yo, Bonnie!" Marcline called out to her as she crossed the distance between them.

Bubblegum shook with a start before turning relaxing at the sight of her girlfriend.

"Thank goodness you're here, Marceline!" she said in a voice filled with panic. 

Marceline couldn't help but notice how tightly Bonnie was keeping her lab coat wrapped around her body. 

"What's with the coat?" She asked. "I thought we were going to hang out but you look like you're in the middle of some serious science biz."

"That serious science biz is exactly why I wanted you to come over. I had a bit of a ... well, let's just call it a miscalculation." Bonnie explained. "I was searching for a new formula for romantic purposes and..."

"Whoa, whoa." Interrupted Marceline. "A romantic purpose? What does that even mean, PB?"

"Ugghh" groaned Bubblegum. "Well, I was researching a new type of lubricant. One that had the power to increase the potency of orgasmic climaxes..."

"Wow" chuckled Marceline. "Is this what you get up to when I'm not around? Getting a little lonely without me?"

Bonnie blushed slightly. "I just thought it could be fun for us to try out... but it all went SO WRONG!" 

"Calm down, Bonnie" Marceline said, trying to sound reassuring. "Just tell me what happened."

The pink haired princess took a long, deep breath. "It would just be easier to show you. Don't freak out!" 

Bonnie slowly pulled the lab coat open, revealing her naked body underneath. Her large breasts hung freely and never failed to impress Marceline as she looked her over from the top down. 

A long semi-hard cock hung between Bonnie's soft pink thighs, complete with a round pair of completely smooth balls tucked away behind it.

Marceline's eyes went wide in shock. "What the Bjork, Bonnie?" she said loudly. "What did you do to yourself?"

Bonnie quickly shut her coat again and shushed Marceline. "Not so loud! I don't want anyone walking in her and asking questions. I admit I screwed up, okay? I just needed you here because I think I have a way to reverse the potions effects. I just need a small piece of your hair. Since the spell was designed with you in mind, my cure requires a sample of your essence. In this case, hair will do."

Marceline was quiet for a long time as she studied the Princess. Emotions ran through her at a rapid pace as she tried to make peace with what she had just seen. The initial shock had worn off quickly and was now being replaced by curiosity and something else. Something the Vampire queen couldn't put her finger down on. Excitement.

"Weelllll" said Marceline in a long drawn out tone. "That's a real pickle, Bonnie. I'd like to help but I just got my hair cut and I don't know that I have any to spare"

PB noticed the grin on the vampires face and anger flushed into her own. 

"This isn't a joke, Marceline! I need that hair and I need it right now!"

"Right now?" Marceline repeated back to her. "I don't know about right this instant..." she trailed off. 

A worried look spread across Bonnie's face. She knew about some of the crazy ideas that sometimes popped into Marceline's head and was worried she was cooking one up right this very moment. 

"Whaaaat are you thinking about..." Bonnie asked with apprehension clear in her voice.

"I just have some questions. That's all" Marceline said cheerfully. "I'll admit it threw me for a loop at first but now I'm kinda curious. Does it work? Like, for bathroom business and stuff?"

Bonnie blushed again, harder. "It works, okay?" she said as quietly as possible. "It does all the things a regular ... one of these ... does. Not if you don't mind giving me just a few strands of your hair I can make it go away."

The princess reached for the long black hair of her girlfriend but Marceline quickly floated several paces backwards away from her.

"What in the GLOB, Marceline! Where are you going?"

"Oh, I'm not going anywhere, PB. I just want something in return for my hair. Nothing's free in life." Marceline said with a grin that chilled Bonnie to the core.

"W-what do you want?"

Marceline floated a little closer. "Let me see it again" she said with a giggle.

Bonnie looked horrified. "WHAT? Absolutely not, Marceline."

"But if you want my haaaiiirrr." Marcline said, singing the last word in her lovely voice. "You're going to have to let me take a little bit of a closer look."

Bumblegum considered her options quickly, running the numbers in her head and not finding another solution. 

"UGH." she groaned. "Fine, take a look quickly you ding dong."

She let the lab coat fall open, exposing herself again as Marceline floated closer. 

Marceline leaned down in mid-air to get a closer look as she smiled. "Well, it certainly looks real. It's pretty big, actually. Pink like the rest of you and very smooth. I gotta say, Bonnie, I think it's actually pretty cute on you."

"CUTE!?" Bublegum said outraged. "You think this looks cute? Why don't you take a sip of the potion then. See how cute you think it looks when it's hanging between your own legs!"

Marceline considered this for a moment. "Would that even work?" she asked. "I'm not made of the same stuff as you, Bonnie."

"OH, it would work" Bonnie said confidently. "But then you'd need some of my hair to reverse it and I don't know how generous I'd feel!"

"Calm down, Peebs. Seems like you're getting all worked up over nothing. Hmmm. Worked up..."

Bonnie spotted that devious look returning to the eyes of her vampire lover.

"Whaaat are you doing, Marceline?" she asked as the vampire slowly slipped one arm out of the tank top she wore. Before she could ask anymore questions Marceline had her other arm free and had pushed the piece of clothing down around her hips. She floated, now naked from the waist up.

Marceline pressed her naked breasts together with her upper arms as she grinned at her girlfriend. 

"I just want to see what happens if you were to see something you like ... and I know you like these." she said, continuing to pressed her perky breasts together.

Bonnie stood dumbstruck not even aware what was happened. "Why would you...."

"See!" Marceline cried out in excitement. "It's growing! I think it likes me, Bonnie."

Bonnie looked down in horror to find the cock between her legs had indeed grown in size. It slowly straightened as it grew stiffer until it was pointing straight out from her body. The princess watched as it completed its transformation, now fully hard and with a slightly curve upwards. Horror gave way to other feelings that she felt rushing into her body. Her gaze at what had happened was only broken when Marceline cut the silence that had grown in the room.

"Have you tried touching it?"

Bonnie looked up at the half-naked vampire and didn't know what to say. She wanted to cry out and flee but something was keeping her feet from moving. 

"Here, let me." Marceline said as she reached down and traced a finger along the under shaft of Bonnie's cock.

The princess shuddered violently. "It ... it does feel okay. Better than okay. I have these strange feelings inside me. I don't know what..." She gasped as Marceline spit into her own hand and gripped the middle of her shaft. The pressure of that hand wrapped around it combined with the warm wetness of Marceline's saliva made her feel momentarily weak in the knees. 

"I've dated boys before you, Bonnie. It's not some mysterious thing that needs to be studied. It's just a cock and when it's hard like that it's easy to see what it wants."

Marceline floated down onto her knees in front of Bonnie without releasing her grip. With agonisingly slow movements she began sliding her hand up and down. 

"Oh, glob..." Bonnie said breathlessly. "That feels...amazing."

Marceline took this at her cue to continue and she used her other hand to gently massage the smooth balls in a light grip. "I bet these work the same too."

Bonnie's head was swimming. One part of her brain screamed out at her to pull away and make this stop. A louder part told her to stay perfectly still and prayed that Marceline continue.

Marceline released the balls and gripped Bonnie with both hands now. She rubbed her thumb under the head of Bonnie's cock, drawing a gasp from the princess standing over her.

"I knew you'd like that. I told you, Princess. This is a very simple tool and lucky for you I know how to use it."

"Yess....use it." Bonnie said, only half aware the words had left her lips.

"I know a lot of other techniques buttttt" Marceline paused. "I don't think you're ready for any of that yet. Let's just stick to the basics for now. Or I could stop? Do you want me to stop, Bonnie?"

She looked up at the tall princess who's eyes seemed to have glazed over. 

"No" PB said. "No, you don't have to stop. It's okay. Keep doing the thing..." she trailed off as Marceline began pumping her cock harder and with a firmer grip. She had lost track of all time and space and could only focus on watching her half naked girlfriend do what she was doing. Bonnie's mouth felt dry and she swallowed painfully.

"Usually the guy prefers a little bit of lube but this works too" Marceline said, spitting on the head of Bonnie's cock before sliding her palm up to coat it with.

Bonnie stumbled backwards but Marceline had anticipated this. She floated a few centimetres off the ground and kept her grip. Eventually Bonnie ran out of room and crashed around a bookshelf. Marceline settled back down and looked up at her girlfriend.

Bonnie stared lovingly down into her eyes as she felt a tremendous force building inside her. "Marceline..." she said in a whisper. "If you don't stop soon something is going to happen." the Princess said, curling her toes in the soft carpet in anticipation.

"Shhh. I know, PB. Just keep looking at me. Let it happen. It going to feel really good, I promise. I want you to come for me, darling. Push everything else out of your mind and just focus on how good my hands feel around your beautiful cock."

Bonnie had rarely heard some lewd language from the vampire queen but in that moment all she wanted to hear was more.

"Ohhh god. Tell me." the pink haired princess said quietly. "Tell me again that you want it." She moaned and writhed, her arms shooting out and looking for something to grip. Several books came tumbling off the shelf before she found something solid enough to hold onto. 

Marceline smiled, soaking in the sight of her girlfriend lost in the pleasure she was providing. "I'm going to keep going until you give me what I want. Let go, Bonnie. I know you want to explode. You need to release the pressure, so come for me."

The soft wet sounds of Marceline's hands pumping up and down combined with the fast breathing of both women in the silence of the room. 

"OoOoH, shhhhii" Bubblegum moaned and she bit down hard on her bottom lip. "It's happening..."

"That's a good girl, give it to me." Marceline encouraged. 

Bonnie felt her legs spasm as she watched a thick stream of white fluid erupt from the tip of her cock and splash against Marceline's naked chest. 

"OHH GLOB!" the princess cried out before silencing herself with a hand over her mouth. She couldn't stop herself from thrusting her hips forward against Marceline's grip, each thrust resulting in another stream of the white fluid firing forward. It coated Marceline's chest, running down her breasts and towards her belly button.

Marceline slowed her pumping down to a pace that was barely moving as she milked out the last couple drops. She released the now spent cock as Bonnie lay with her back pressed against the book shelf, panting loudly.

"Marceline that was..." she tried to say while catching her breath. "That was..."

The vampire said nothing in return but chose to simply float upwards and kiss her girlfriend deeply on the mouth. She quickly plucked a few long black hairs from her head and folded Bonnie's palm around them.

"That was fun, Bon." she said, kissing her on the forehead. "Maybe keep a bottle of that potion handy. Who knows? Maybe we could have some more fun with it later. If you enjoyed my hand so much.." she said leaning in to whisper in the Princess' ear. "Just wait until you find out how good I can make you feel with my mouth."

She cackled loudly, zipping back out the window she had entered from and left the Princess barely standing under her own power.

"Her...mouth?" Bonnie repeated back to herself as she looked down at her now deflating cock, still dribbling it's slimy fluid down onto the carpet.

Chapter 3: The Princess and the Dommw

Her brain was racing with a hundred thoughts but the most prominent was the one where Marceline's mouth was around her... her... she couldn't even think the word.

Marceline's voice was suddenly back in her ears, a soft whisper that seemed to echo in the room even after the vampire had left. "Just wait until you find out how good I can make you feel with my mouth."

Bonnie pulled the cloak tighter around her as she entered the cave the held Marceline's home, unable to believe she was really doing this. The wood creaked under her feet as she approached the front door and knocked.

"It's open!" Marceline's voice echoed down the stairs.

The door to Marceline's ancient treehouse swung open on its own, revealing the dimly lit interior. Bonnie's heart hammered in her chest as she took a tentative step inside, her newfound appendage swinging awkwardly between her legs. The vampire's mischievous laughter washed over her, seeming to come from all directions at once. She took a deep breath and began climbing the stairs, each step feeling heavier than the last.

"Marceline?" Bonnie called out into the dark room? She could see a faint glow coming from the upstairs bedroom and moved forward cautiously. "What's going on?"

Marceline's voice grew louder as she ascended the ladder. "Just getting ready for you, PB!"

Finally reaching the top, Bonnie saw Marceline sprawled across her bed, her legs spread wide and bent at the knees. She wore a skintight black latex corset that left very little to the imagination, the shiny material hugging every curve of her body. Long black gloves and thigh-high boots completed the ensemble.

Bonnie felt some of the pink drain from her face as she took in the sight.

Marceline cackled, seeing the expression on her girlfriends face. "I knew you'd come" she laughed with a grin that showed the whites of her fangs. "Percect Princess Bubblegum being lead around by her cock like so many helpless fools."

Marceline turned to head to the side in a questioning pose.

"You did keep it, didn't yoy? At least for a little bit longer. Oh, glob don't tell me you got rid of it already?"

Marceline's voice was filled with a mix of hope and disappointment as she sat up in bed.

Bonnie gulped before she slowly nodded. "I... I still have it, Marcy" she replied, her voice quivering slightly.

Marceline cackled again with what sounded to Bonnie like victory in her tone. The vampire queen ran her tongue over her ruby red lips slowly. "I had a feeling when I left you with that little tease about my mouth that'd you might decide to keep it. Maybe the perfect Princess is a bit of a freak"

Bonnie stamped one foot on the soft carpet "Now hang on a darn minute!" Bonnie protested. "I only kept this...thing... because you're the one who was acting like she'd croak if I got rid of it."

Marceline rolled over onto her stomach, the leather of her corset creaking with the movement. "Oh, come on. You know you're enjoying this. That little show you put on earlier was quite the turn on."

Bonnie blushed and looked away, trying to hide her face from the vampire's piercing gaze.

"No need to be embarrassed, Bonnie. I liked the show. I've been thinking about a repeat performance. Show me the goods" she said with a smirk.

The pink haired princess took a moment to gather herself. The feelings of excitement and fear that she had felt earlier were starting to boil back up. She slid her purple dress down around her ankles and stepped out of it, leaving her barefoot. She felt incredibly exposed standing there with her new cock and balls fully visible in the dim light of the room.

Marceline's eyes went wide as she took in the sight. "Look at that, Bonnie" she said, her voice dripping with lust. "You're already rock hard for me. Did you miss me that much?"

Bonnie felt a thrill of fear and anticipation at the question. "I don't know what's happening to me, Marceline."

With a grace that seemed almost predatory, Marceline floated over to her, her eyes never leaving the glowing pink cock. Her movements were deliberate, almost hypnotic, as she leaned in to kiss Bonnie. Her lips were soft and cool against the princess's own, and Bonnie felt a shiver run down her spine. The kiss was gentle at first, a mere brush of skin against skin, but it quickly grew more passionate. Marceline's tongue slid into her mouth, and Bonnie moaned involuntarily.

Marceline broke the kiss and smiled. "I know what's happening and I'm going to show you. I'm taking the lead on this one, big brain. Do exactly what I tell you and I'll blow your little candy brain"

Marceline's hands slithered down to Bonnie's waist, gripping her firmly as she pushed her onto the bed. The latex was cold against the candy girl's skin as she lay there, staring up at the vampire who hovered above her, a devilish look in her eyes.

"Now, let's get down to business," Marceline said. "You're going to let me show you what I can do with that thing between your legs. When I say to do or not do something, you're going to listen, right, Princess?"

Bubblegum swallowed the initial outrage she felt as the growing pressure between her legs pushed it aside.

"Y-yes," she replied meekly. "I'll do what you say."

Marceline's grin grew wider. "Good girl. Now, I want you to lie back and let me take control."

Bonnie's heart was racing as she watched Marceline lean over her, the vampire's breasts pressing into her own. Her mind was a whirlwind of thoughts and emotions, but she found herself nodding in agreement. Marceline's confidence was infectious, and despite the absurdity of the situation, she felt a thrill of excitement.

Marceline hovered above her, her black eyes gleaming with desire. "Now, let's see what we're working with," she said, her hands reaching down to stroke the length of Bonnie's cock. The princess's breath hitched as she felt the vampire's cool touch against the hot, sensitive skin.

"Marceline," Bonnie began, her voice shaking. "I don't know if I can handle..."

Marceline silenced her with a soft, yet firm kiss. "Shh, PB," she whispered, her breath hot against Bonnie's ear. "I've got you."

Bonnie's body responded almost involuntarily to Marceline's touch. She laid back on the bed, her eyes fluttering closed as the vampire's hands continued to explore. The coolness of Marceline's skin was a stark contrast to the heat of her own, and every time those hands brushed against her, it sent a jolt of electricity through her. Bonnie's heart raced, and she felt a sense of vulnerability she had never experienced before.

Her own hand moved on its own accord to cup one of Marceline's perky breasts, but was slapped away with surprising force. "No," Marceline said, her voice firm.

"What the stuff, Marceline?!" Bonnie protested, rubbing her hand.

"I'm in control now," Marceline said with a wink, her hands continuing their ministrations. "You just lie back and enjoy."

Bubblegum did as she was told, her heart pounding in her chest as she felt the vampire's cool hands moving over her. Marceline started with slow, deliberate strokes, exploring the length and girth of her new cock with a curiosity that was both thrilling and terrifying. The sensation was overwhelming, and she could feel herself getting wetter by the second.

"Close your eyes and relax, Bonnie," Marceline repeated, her voice a sultry purr.

Bonnie took a deep breath and did as she was told. The room grew dark behind her eyelids, but the sensation of Marceline's hands on her remained vivid. She felt her body sink into the mattress, the weight of the situation pressing her down.

Marceline's spoke with a confidence that Bonnie had never heard from her before. "This cock," she said with a hint of possessiveness. "It's mine now, Bubblegum."

Bonnie's eyes shot open in shock. "What?!" she squeaked. "What do you mean 'it's yours'?"

Marceline leaned in closer, her breath cold and sweet against Bonnie's neck. "I mean that I want to keep it," she murmured, her grip tightening around the base of the cock. "You can have it back after I've had my fun."

Bonnie's eyes widened in shock. "Marceline, I can't... I mean, I need it reversed!" she protested weakly, but the words seemed to stick in her throat as Marceline's hands continued their delicious torment.

"Do you really want it back, Peebs?" she whispered. The hand around Bonnies cock releaed its grip, letting the stiff member bounce back and forth on its own. "Becauese I don't share."

Marceline licked her lips, which were painted a deep crimson, and bent her head down to the trembling cock before her. She licked it from base to tip, her tongue lingering just under the head.

"Mmm, it's so sweet," she murmured before looking up at the wide-eyed princess. "But tell me, Bonnie, whose cock is this?"

Bonnie's eyes went wide. "What?" she squeaked, her cheeks burning hotter than the sun.

Marceline smirked up at her, her mouth so close to the tip of her cock it was almost touching. "You heard me," she said, her voice low and seductive. "Whose cock is this?"

Bubblegum felt a wave of embarrassment wash over her. "It's... it's your cock, Marceline," she murmured, her voice barely audible.

L"I knew you'd say that, you're a smart girl" she whispered, and then, without warning, she lowered her head, taking Bonnie's cock into her mouth.

Chapter 4

Marceline's mouth was surprisingly warm, a stark contrast to the coolness of her hands. She sucked on the tip gently at first, her tongue swirling around the sensitive head, sending shockwaves through the princess's body. Bonnie's eyes rolled back in her head as the vampire took more of her in, her teeth grazing the shaft lightly, sending a delicious shiver down her spine.

"Oh globbbb" Bonnien moaned into the darkness of the room.

Marceline's eyes remained closed, her expression one of intense concentration as she began to take more of Bubblegum's length into her mouth.

Bonnie's body arched off the bed, the pleasure almost too much to bear. She felt like she was floating, the only thing keeping her anchored to reality was the feeling of Marceline's mouth on her cock. The vampire's tongue danced around the shaft, exploring every inch of the new addition to her lover's body. It was as if Marceline was savoring the taste of her, committing it to memory.

The wet sounds grew louder as Marceline took more of her in, the saliva mixing with the pre-cum that leaked from the tip. The room was filled with the symphony of their muffled moans and the slurping of a mouth eagerly devouring the sweet treat. Bonnie's eyes were glued to the sight of her lover.

Bonnie could help but brush as she considered what was actually happening right now. She had to fight the urge to buck her hips upward and deeper into Marcelines mouth.

"Marceline," she whispered, her voice strained with arousal. "Marceline, I think... I think I'm gonna... oh gheeze, I'm gonna..."

Marceline abruptly pulled away, her mouth leaving a wet, glistening trail on Bubblegum's cock. She sat back on her haunches, her eyes flashing with an unspoken warning. "No, you don't," she said firmly. "Not yet."

Bubblegum whined, her hips jerking involuntarily. "But I can't
..."

Marceline chuckled darkly. "Oh, you can," she said, her eyes gleaming. "And you will."

Bonnie's cock throbbed with the need to release, but she bit her lip and nodded. Marceline had always had a way of getting what she wanted, and right now, she wanted to watch Bubblegum come apart at the seams.

"Precious perfect Bonnibel," Marceline said, her voice a mix of amusement and desire. "Don't you know it's rude to just go shooting off into a girl's mouth with barely a warning?"

Marceline's hands moved to Bubblegum's inner thighs, spreading them wide. She took a moment to appreciate the view before her: the pink cock standing tall and proud, the glisten of pre-cum at the tip, and the sweet, sugary scent that filled the air. It was a scent that made her hunger for more, and she licked her lips in anticipation.

"But," she said, her voice a purr, "I do love it when you're all eager for me."

Marceline leaned in, her teeth lightly grazing the sensitive skin of Bubblegum's inner thigh, making the princess jump. "But we're not quite there yet," she whispered, her breath cool against the flushed flesh.

"Roll over," she ordered, her voice firm but not unkind. "Get on all fours."

Bubblegum complied, her suspicion growing. She looked back over her shoulder, her eyes wide as she tried to gauge Marceline's intentions. The vampire's smirk was the only answer she received before a cool hand smacked her ass, sending a jolt of pain and pleasure through her body.

"Marcy!" she yelped, the sting fading into a warm glow that made her cock throb even harder.

Marceline had to try and contain her laughter as she watched Bonnie's cheeks turn red.

"Now, now," she chuckled, "No need to be shy. That's your body now, PB. And it's a pretty amazing body. I just want to know one thing..."

Marceline reached forwards and gripped Bonnie's ass, spreading her pink cheeks and eyeing the dark pink ring sitting between them.

"Does absolutely every part of you taste so sweet?"

Marceline's question hung in the air, thick with a mix of amusement and lust, as she moved in closer to Bubblegum's exposed ass. Bonnie felt a blend of shock and anticipation as the vampire's tongue darted out, brushing against her tight hole. The sudden sensation was unlike anything she had ever felt before, and she tensed up instinctively.

"Marcy...what are you..." Bonnie started to stay. The question died in her throat when she felt the tongue push itself into her asshole as a hand gripped her cock and slowly started pumping up and down.

Marceline's tongue was surprisingly gentle, tracing the edges of her sphincter before delving deeper. The sensation was strange, foreign, and somehow incredibly erotic. Bonnie's body quivered as she felt the vampire's tongue inside her, exploring, claiming. It was an intimacy she had never before experienced, and it sent her spiraling closer to the edge.

Marceline's hand continued to stroke Bubblegum's cock, her grip firm and steady. She could feel the candy girl's muscles tense, her breathing become ragged. Bonnie's whimpers grew louder as the vampire's tongue delved further, swirling and probing. Marceline felt the urge to laugh at the way Bonnie squirmed under her touch, but she kept her composure, focusing on driving her lover to the brink.

"Marceline," Bubblegum gasped, lowering her head against the softness of the fabric beneath her.

Marceline's tongue withdrew and she smacked her lips. "What, PB?" she said, her voice mockingly innocent.

Bubblegum took a deep breath, trying to gather her thoughts. "I just...I didn't know you liked that," she murmured.

Marceline leaned back, her eyes gleaming with mischief. "Oh, I like a lot of things," she said before returning her mouth to Bonnie's hole.

Her tongue delved in deeper, the sensation causing Bubblegum's cock to twitch in her hand. Bonnie couldn't believe the depths of pleasure that were being drawn from her body. It was as if she had been missing out on this all her life, and now it was all she could think about.

Marceline's hand pumped faster, her tongue moving in sync with the rhythm. The vampire was in complete control, pushing Bonnie closer and closer to the precipice of ecstasy. Bubblegum's moans grew louder, her body shaking with the force of her impending climax.

Then, without warning, Marceline added a finger to the mix, pressing it against Bubblegum's tight entrance. The sudden intrusion made her gasp, but she didn't pull away. Instead, she pushed back slightly, encouraging the vampire to continue.

Marceline's eyes gleamed with satisfaction as she slipped her finger inside, feeling the heat and tightness of her lover's body. She pushed in slowly, letting Bonnie adjust to the sensation. The candy girl's breath hitched as she felt herself being stretched open.

"Marceline!" Bonnie gasped, her voice strained.

Marceline pulled her head away and smirked at the panting princess. "Do you want me to stop?"

"No," Bubblegum whined, her eyes pleading. "Don't stop, please."

Marceline chuckled, her finger moving in a slow, rhythmic pattern, pushing in and out of her lover's ass. The sound of their combined breathing filled the room, punctuated by the wet sounds of Marceline's digit moving in and out.

"Good girl," Marceline murmured, her voice thick with desire. She leaned back and took a moment to appreciate the sight before her: Bubblegum's perfect pink body on all fours, her ass in the air, her cock pointing straight down and leaking pre-cum onto the bed.

The vampire's hand paused in its stroking, and she added a second finger to the mix. Bonnie's body stiffened as the cool digits penetrated her, the sensation more intense than before. Marceline felt the tightness around her fingers and knew she had to be gentle.

"Relax, PB," she whispered, her voice soothing. "It's okay, let me show you how good this can feel."

Marceline began to move her fingers in a way that made Bubblegum's vision swim. The pressure was building, the sensations overwhelming. She had never felt so filled, so claimed. The thought of Marceline inside her was more than she could handle.

"Marcy, I'm...I'm gonna...!" she warned, her voice high and breathy.

Marceline chuckled darkly. "Do it," she said, her voice a mix of demand and encouragement. "Cum for me, PB."

With a whine that was part pleasure, part desperation, Bubblegum did as she was told. She bit down hard on the sheets, her teeth sinking into the fabric as her body convulsed. Her cock erupted in Marceline's hand, sending streams of thick, white cum shooting down onto the sheets under her. The vampire watched with a mix of amazement and satisfaction, her eyes never leaving the spectacle before her.

"Good girl," Marceline murmured, her voice filled with approval. She took a moment to admire the sight of Bubblegum's spent body, trembling with the aftershocks of her orgasm. Then, she leaned in and licked the last drops of cum from the head of the cock, savoring the taste.

Bubblegum collapsed onto the bed, her legs giving out beneath her. She lay there, panting and trying to catch her breath, her body feeling like it had just been put through the wringer. The pleasure had been intense, almost painful, but in the best way possible.

Marceline sat back on her haunches, watching her with a look of smug satisfaction. She licked her lips, savoring the taste of Bubblegum's cum. "See?" she said, her voice low and smoky. "Was that so bad?"

Bubblegum looked back over her shoulder, her eyes glazed with lust. "No," she murmured, her voice hoarse from the screams she hadn't realized she'd been holding in. "It was..." she paused, searching for the right word. "A-amazing."

Marceline smirked, licking her fingers clean. "I knew you'd like it."

Suddenly, the room was filled with the shrill beeping of Bubblegum's wrist device. The candy princess groaned, the sound jolting her out of her post-orgasmic haze.

"What the...?" she mumbled, lifting her head from the bed.

Marceline's smirk grew wider. "Someone's popular," she teased, gesturing towards the wrist device.

Bubblegum groaned, rolling over onto her back. "It's probably just another one of those science emergencies," she said with a sigh. "You know how it is."

Marceline watched as Bubblegum scrambled off the bed, her body still trembling from the intensity of her climax. The vampire couldn't help but feel a twinge of disappointment as she watched her lover pull on her clothes with frantic haste.

"I've got to go," Bubblegum said. "But...will you come by tomorrow? I would like to see you again"

Marceline nodded, her eyes still gleaming with desire. "Count on it," she said. "I've got a few more...experiments I'd like to try."