Finn wasn't altogether sure what he'd been invited over to Bubblegum's for. He'd initially assumed she had some form of mission for him, but it seemed that she may actually have just wanted to hang out, which was great to.
Upon opening the door however, Finn's began to suspect he may have gotten the time he was supposed to have arrived wrong. Bubblegum and Marceline were on Bubblegum's bed, with not a shred of clothing between them.
Marceline had Bubblegum pinned to the bed, her fangs grazing across the soft skin of her neck as her fingers worked aggressively between her legs.
"M-more Marcy~" Bubblegum groaned, hips bucking desperately against Marceline's fingers. Marceline let her tongue drag across Bubblegum's neck, "Glob I love teasing you Bonnie~" She purred dominantly, showing no signs of stopping.
Finn, realizing he had walked in on their private time, turned around to leave before he ruined their moment.
He didn't get very far before he felt a hand grab his wrist, yanking him into the room. Said hand was Marceline's free one, shapeshifted to reach out to Finn. The vampire girl grinned as she shut and locked the door behind Finn before her hand returned to normal.
Catching on quickly, Finn said, "I.. didn't get the wrong time, did I."
Marceline shook her head, "Nah, we were gonna wait for you to get here before we got started, but we just got a little.. Excited. Sorry, Bonnie gets so impatient when we're alone."
Bubblegum may have been attempting to defend herself, but it came out as little more than a low groan as her body tensed, shaking as her climax soaked Marceline's fingers.
"So… what's the occasion?" Finn asked, smile returning. Having established he wasn't intruding, he could happily relax and shed his clothing to join in the fun.
"Equal parts prize and bribe," Marceline said.
"Too.. over.. Simplify.." Bubblegum amended, seeming less than please with Marcy's abbreviation.
Rolling her eyes, Marceline explained further, "Bonnie wanted to say thanks for helping the kingdom so long, and for helping stop her plunge Ooo into full tilt war. If we'd been in the middle of a battle when Golb showed up, we'da been iced. So when Huntress Wizard came in with an offer… we decided to take the opportunity."
Finn smiled, guessing from Marceline's expression what kind of bribe his mate had offered. Finn had started to wonder lately if his heat hadn't faded so much as just gone to her sometimes. He would have to thank her when he got back. Right now though… he wanted to indulge himself and enjoy the moment. And with him stripped down and his sizable rod in full view, Bubblegum and Marceline seemed to be all the more sure of their decision.
Marceline pulled Finn up onto the bed, setting him down between herself and Bubblegum, who had by now recovered enough to start again. Finn moaned softly as he felt the two of them going to work on him, Bubblegum's tongue rubbing along his tip as Marceline's longer, demonic tongue wrapped around his base and stroked him.
Finn groaned, reaching out with his hands, which extended as grassy vines, allowing him to reach Bubblegum and Marceline's pert rumps, groping both of them together.
This encouraged them to keep going, licking and even starting to suck as Finn moved from groping to fingering the two of them, Bubblegum's head bobbing along his shaft as Marceline sucked at his balls, amplifying the pleasure intensely. Finn's moans grew louder as he attempted to keep up with them, his grassy limbs becoming even more vine-like so they could go from just fingering the two of them to fucking them from behind as they pleasured him in turn. Both of them moaned hard against Finn's member, getting faster and sloppier in their movements, increasing the pleasure further with the faster pace.
Finn's hips thrust up gently, Marceline responding by reaching up and pushing Bubblegum's head down, forcing her to the base of Finn's cock roughly. She gagged from the sudden stuffing of her throat, Marceline preventing her from raising her head as Finn came, pumping hot seed down her throat.
Bubblegum raised her head the moment Marcy allowed her to, but before she could scold Marceline for not warning her, the vampire pressed her lips hard against her, tongue snaking into her mouth and wrapping around Bubblegum's own.
Bubblegum groaned, not wanting to just let her off the hook, but between her and the vines pumping hard into her slit, she couldn't maintain any anger, and soon found herself shaking against Marceline as they came together from Finn's vines.
Panting heavily, Bubblegum allowed Marceline to reposition her, positioning her over Finn's still stiff member, which seemed to have grown even harder in anticipation. Finn's vines returned to his hands, taking ahold of Bubblegum's hips and lining her wet, warm slit up to his tip. Bubblegum bit her lip as she felt a second cock slap against her literal bubble butt. Marceline was extremely fond of her shapeshifting, especially when it came to the bedroom it seemed.
Before Bubblegum could get out the words 'a little easier this time?' Marceline had thrust into her tight, puckered hole hard from behind, stretching it with her entrance and, with the force of the thrust, forced her down onto Finn's cock as well.
Finn responded immediately, thrusting up immediately to push even deeper into Bubblegum, the princess crying out as she was stuffed aggressively with no gentleness in sight.
The sounds of their grunts and moans only got louder as they pumped into her together, putting their enhanced strength and endurance to good use as they rutted into her, the sound of skin slapping against skin almost as loud as their moans as Marceline and Finn both attempted to bury themselves to the base inside of her, thrusting in rhythm together.
Bubblegum's moans drowned out both of them, the overwhelming pleasure dulling her ability to care how sore she was going to be the next morning, and soon any pretenses of asking them to slow down were replaced with pleas for them to pick up the pace.
Granted, Bubblegum might have reconsidered such suggestions if she'd known they'd still be going the next morning…
Note 1. Next chapter will be the finale ^^
Note 2. You've got no idea how hard it was for me to not make this chapter involve PB's bishe boy heartthrob form from Don't Look XD