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Oh, Marceline!	By : Kataangfanficer Category: +1 through F > Adventure Time Views: 39118 -:- Recommendations : 1 -:- Currently Reading : 1
Disclaimer: I do not own Adventure Time. I make no profit from this. It was written only for entertainment.

Chapter List
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Sorry for taking so long to write a new chapter. I was going to write one after that amazingly ship-tastic episode with "I'm Just Your Problem". But trying to fit in that plot into my story just wasn't working out, so I abandoned the idea. I guess a version of that episode could take place after my story with Marceline's shirt being replaced with her panties. I still can't believe that part! It's probably just a huge coincidence, but having PB keep a piece of Marceline's clothing seems frightfully close to my fanfic. I guess I'm not the only one that thinks it's adorable. :3
I haven't written in a while, so I don't think this is my best work. But hopefully the next chapter will be better, and I'm hoping to write it within the next week or two.

“This is a bad idea…” Princess Bubblegum whispered.
“We can’t back out now,” Marceline shot back. “Everything has lined up perfectly for us so far. I’m not going to let your foo foo attitude get in the way. You’re the one that wants “the sample” so bad anyway.”
“But…”
“The only butt I’m interested in right now is Finn’s, so chill out, PB!”
It had been over a month since the friends had peeked on Finn and got a look at his wonderful extremities, and they had conceived a masterful plan to get a certain sample for the Princess’s private experiments. All they had to do was break into Finn and Jake’s house, which turned out to be incredibly easy. The hard part was waiting for the right circumstances. They finally found a day when Jake was going to be away at Lady Rainicorn’s house for fun rainicorn festivities, so they wouldn’t have to deal with him. Marceline and Bubblegum also needed to find a way to extract the sample from Finn without him knowing. They thought of just waiting until he went to bed, but Princess Bubblegum didn’t want to take any chances. So she concocted a special sleeping potion that would put him in a super deep sleep during his normal bedtime, and she slipped it into his drink while they were hanging out earlier in the day. Everything was in place, expect for Princess Bubblegum’s nerves…
“You’re starting to take the fun out of this.” groaned Marceline.
“Science isn’t always fun,” Bubblegum said in her defense while putting on a pair of dorky goggles. “Science requires discipline.”
“SEX!” Marceline shrieked in frustration.
“…what?”
“This isn’t about science, and you know it. It’s about sex!”
“Can’t we come to a compromise and say it’s about both?” the princess answered with calm maturity.
“Fine. Let’s just get on with it. I’m craving some Finn ass.”
“Alright. You can prepare him while I prepare the machine.”
“Oh I’ll prepare him alright,” the vampire said with a grin.
Marceline pulled Finn’s blankets off of him and slowly removed his jammies; the gravity of the situation didn’t hit her until the adventurer’s jiggly boyhood came into view. After staring at it with a goofy look on her face, Marceline was suddenly broken out of her trance by her sciency friend.
“Wait!” shouted Bubblegum as she quickly put on a pair of white rubber gloves.
As if by magic, the princess pulled out a measuring tape and indulged in her curiosity.
“Aha! Finn the human’s penis shaft is exactly 5.3 centimeters long when flaccid!” she cried out as if she were creating a mental log of her finding.
Marceline put her hands up to her mouth and mimicked the cheers of a massive audience. “Pretty exciting stuff, PB,” she chuckled.
“Now I just need a measurement of it when it’s erect, and I can get back to preparing my machine.”
“Allow me.”
Princess Bubblegum watched as Marceline draped herself on top of Finn and clutched his adorable face with uncharacteristic tenderness. She slowly removed his hat to reveal his golden hair and leaned in to kiss the sleepy adventurer. Her lips pressed into his with a wet squeaky sound, and she began to grind her hips against Finn’s naked body to match the intimacy of the kiss. Princess Bubblegum blushed at Marceline’s unapologetic behavior, and she caught herself enjoying the vampire’s curves as much as she admired Finn’s naked body. Her round ass rocked back and forth as she tried to coax a reaction from Finn’s sleepy lower half, and her jeans seemed to be even tighter than usual.
“Come on, Finn,” Marceline moaned seductively. “Get hard for little ol’ Marcey. Don’t you like being dominated?”
Marceline pinched Finn’s cheeks to make it look like he was talking back, and she did her best impression of him. “Oh yes, Marceline! I’d let you ride me anytime!”
“Spank me, baby!” Marceline screamed overdramatically as she grabbed Finn’s limp arm and spanked herself with it. She finally lost it and rolled off the bed laughing; she never had a hard time getting a kick out of her own antics.
“I’m starting to realize how weird this really is…” Princess Bubblegum muttered as she finished the rest of her preparations.
“It’s only as weird as you make it, PB.”
“Correction. It’s as weird as YOU make it…”
“Well you can turn back now if you want, or you could turn around and see the results of my handiwork.”
Princess Bubblegum did just that, and she immediately went for her measuring tape again without taking her eyes off of Finn.
“13.7 centimeters?!” she gasped. “He’s even larger than I had guessed…”
“Ready for some science, PB?”
“…oh right. Science!”
The princess managed to pull herself away from her naked little hero and grab her machine.
“So how exactly does this thing work…?” Marceline asked with genuine concern as she eyed the intimidating device.
“Simple! Finn’s penis goes into this clear nozzle—”
“Proof!” Marceline said with excitement.
“Excuse me?”
“Why else would you make that part clear if you were only interested in the science?”
“…well, because…”
“Bonnibel wants to keep an eye on the prize!” she said with a wink.
“No… It’s just that I need to make sure nothing is going wrong, so I need to be able to see inside of it.”
“Whatever. So what’s the next step, Miss Science?”
“I’m glad you asked,” Princess Bubblegum answered after clearing her throat. “The next step is also quite simple. I just press this button, and the extraction begins.”
“So Finn’s love juices go through the tube and into this tank?” Marceline said while she poked the hollow container.
“Precisely. Except for the whole “love juices” part. It’s called semen, Marceline. Semen. Love has nothing to do with it.”
“I don’t know, Bonni. I’ve shown quite a few guys some lovin’ in my day, and they’ve all returned the favor in their special way. Sometimes more than once.”
“...First of all, I’m not interested in your sexual escapades, Marceline. And second, that was most likely lust, not love. Therefore, your claim remains irrelevant. Love and semen are completely unrelated.”
“How can you say that? I’ve seen that look in your eye when you look at Finn. If you guys got a little cozy and got Finn to make a mess on you, I’d say that would count as love.”
Princess Bubblegum simply blushed and avoided eye contact with her relentless friend.
“You know I’m right,” said Marceline.
“You can’t use hypothetical situations as proof. And even if something like that happened…the presence of love wouldn’t have been what brought about the semen. It would have been the prolonged stimulation of the penis by the vaginal lips or the tongue.”
“…tongue? So you’re putting a blowjob into this little hypothetical situation?” Marceline said mischievously.
“I didn’t say tongue!”
“Yes you did.”
“Enough! It’s time for science!” the princess shouted with a hint of madness in her normally sweet voice.
She pressed the button with vigor to change the subject, and soon she and Marceline heard the intense pumping that began to milk Finn of his juices. The nozzle was wrapped snuggly around his erection, and it vibrated slightly. But not a single drop of semen was being sucked through the tube. Princess Bubblegum examined it to check for tears or holes in the soft rubber, but it seemed to be intact. The pumping was certainly working because the sound it made was quite loud.
“All this trouble for a little jizz, and you can’t even get a drop,” sighed Marceline. “We could just do it the old fashion way, you know.”
“And how would you suggest we collect the sample with that method?” answered the princess with sarcasm.
Marceline simply puffed out her cheeks in response.
“…no. My machine will work. Just give it time.”
“What’s this dial do?” asked Marceline.
“Don’t touch anything!”
“Too late.”
Marceline turned the dial. The nozzle immediately began to vibrate faster, and the machine’s pumping sounded much more intense. Finn’s penis throbbed and released several bursts off semen, which traveled swiftly through the tube and finally dripped into the machine’s large tank.
“Success!” shouted Princess Bubblegum with glee.
Marceline pressed her face against the clear tank and stared at the less than thrilling puddle of semen at the bottom; it could barely even be called a puddle.
“That’s it?”
“Of course, Marceline. I’m sure you’re more than aware of how much semen a male typically releases per ejaculation.”
“Well yeah but…I assumed you had something else up your sleeve considering the size of this tank.”
“I just wanted to be prepared,” the princess said with a shrug.
“Well that was a letdown… Wanna make out?
“What?! …no!”
“You’re impossible, PB. Even with a hot stud lying naked in front of you with his cock literally throbbing, you still can’t just chill and let loose.”
Princess Bubblegum pretended not to hear her and began to write in her science journal.
“Well, I’m not going to let you bring me down to your level,” Marceline said with confidence while she took her top off and threw it on the ground.
“We’re done here, Marceline. I got what I came for.”
“Like hell we are!” shouted the vampire, who was now braless.
The princess continued to ignore her and began to get ready to leave. After shutting down the machine, she carefully pulled the hose off of Finn’s penis and placed it on the floor next to the tank. Finn’s once proud erection was now only a shadow of its former self. It flopped over to one side, and a drop of semen dripped down onto his sheets like a white tear.
“Awwwww. Look, Bonnibel. You made it cry. Not cool. Not cool…”
Princess Bubblegum subtly glanced over at Finn. “Don’t be silly. It’s just a—”
“Poor little guy,” Marceline moaned as she patted Finn’s penis. “All he wants is some love, but all you gave him was the cold hand of science.”
“Please just—” But this time the princess cut herself short.
Marceline had Finn’s entire penis in her mouth.
“No! Bad Marceline!” scolded the princess as she smacked Marceline’s head with one of her gloves.
“Wups your pwoblem?” Marceline said with her mouth full.
“You can’t just go around putting penises in your mouth!”
Marceline gently released Finn from her mouth’s wet embrace and stared at Princess Bubblegum with a scowl. “Are you serious?”
“Of course am I! Penises are private things and shouldn’t be treated like toys.”
“…take a second to think about what you just said. Then I suggest you take a look at that giant penis milker next to you.”
“Totally different!” shouted the princess.
“How?”
“I was merely extracting a sample for scientific purposes with the utmost care.”
“…you literally sucked his cum through a hose, ya freak.”
“Well of course it sounds much worse when you say it like that…” mumbled Bubblegum.
“And I didn’t hear you objecting when I was giving Finn a lap dance with my tongue down his throat.”
“You had your tongue down his throat?!”
Marceline smirked.
“Just leave Finn alone. He’s not a toy…” said Princess Bubblegum.
“You’re right, PB. He’s a test subject,” mocked Marceline.
“You just don’t get it, Marceline!” the princess shrieked as she took off her goggles and threw them at her obnoxious friend. “And put your shirt back on! You’re turning a simple and respectful scientific exercise into something obscene.”
“Tits aren’t obscene, you prude!”
“I’m not a prude…” she mumbled.
“Prove it. Get naked, babe.”
“What? No!”
“I’ve seen you naked before…”
“That’s not the point. I just—”
“Well, I could always just make up some lame lie about wanting to check out your bod again in the name of science or something…”
Princess Bubblegum suddenly ripped all of her clothing off with a few frustrated growls, until she was completely naked. Her pink breasts jiggled as she stomped her foot firmly on the ground and placed her hands on her hips.
“Point taken, PB. Now bend over.”

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Oh, Marceline!