Finn and Marceline were making out on her couch. She took Finn's advice for an actually comfortable couch which made the experience more cozy and less back numbing. Finn was teasing Marcy by swirling his finger around her outer rim while Marcy was gripping and racking his back. Both were tongue pressing and blushing(marceline had to keep herself from gnawing Finn's cheeks off). As they were kissing, signs of black veins appeared and disappeared from her skin as it crawled to her body. Finn started to grope and caress her right breast as Marcy started to pinch his butt. Marcy could feel her lust build as she wanted to pin Finn to the ground and ride him till he was red enough for her to eat and drain the from, but kept in line as he was usually able to keep her hunger in line. The blackness started to be more apparent as it traveled up Marcy's body, looking like ink in a glass of water as it peered in and out. Marcy was panting and moaning as Finn made her feel wetter and wetter, taking ever ounce of willpower to keep from giving him a hickey that would lead to a lifetime of sucking red. Finn finally noticed as the inky veins popped up on her cheeks.
"Marcy, that's that black stuff on your cheek?" Finn asked
"It's an after effect of the soul purging, which reminds me of something I wanted to do before this true love and rotting soul nonsense." Marcy said as she got up and walked to the fridge. Finn looked and grinned as she(likely on purpose) bent down to the second shelf and showed off her curvy butt to finn. If he didn't have immense respect and willpower, he'd plow into her rump right there in the kitchen. Marcy was eating an awful lot of red for some reason. It caused the black marks to look more refined and detailed. She ruffled her hair up a bit and took a deep breath, her vampiric featured peering in and out. She walked over to Finn and sat up to him with her back up against his chest. She pulled him by his chin to her and gave a snake like hiss before kissing him. As the two sucked face, Finn started to massage her shoulders. Marcy was already moaning and leaned closer onto Finn. Finn moved his arms down her neck and felt her soft neck(and marks) before moving down to her chest. He grasped her boobs and started to lightly pinch her left nipple, making her blush and moan harder. Marcy deepened the kiss and started grinding against his waist. Finn felt flustered but let her continue as he didn't want to ruin the moment. Marcy was a lot more playful and aggressive than normal, thought it might have been from the crazy adventure they went through. Marcy grinned as she could feel Finn's package started to harden and rub against her cave.
"Time to go to work." Marcy thought
She lifted herself up over Finn's tool, positioned in a way to keep them from breaking their kiss, and slammed down into him. Finn yelped through the kiss as he felt his stick go inside her anus. It felt warm and slightly moist. He was blushing as Marcy flexed to get a good feeling of him inside her this way. She then stared to rise up and slam back down. Finn started to blush as their back foot action kept going. Marcy had a face of mindless bliss as she kept going, his shaft going in deeper and deeper as she went. Her state of mindless bliss was extravagant. Her breast were bouncing and halfway towards her face as she thrusted. Finn was groaning as the sex continued, he was sure they were gonna break the couch from this. Marcy shoved 3 fingers into her crevice, wanting to pleasure every part of her that she could. Finn grabbed her breasts again , causing Marcy to cackle from the pleasure and slight tickling sensation. Both shrieked with pleasure as they came, Marcy's dripping onto the couch while Finn's oozed out of her butt and down his thigh. Both were panting and giggling from the experience, Marcy getting up and cracking her fingers.
"Well Finn, you are quite the partner." Marcy said as she pulled her hair back
"Oh, well thanks." Finn said blushing
"Now it's time to give you something I've never given anyone else, a little something only i can give you." Marcy said as she grabbed and sucked the red out of the bowl of apples she had next to the couch.
"And what might that be?" Finn said slightly nervous
"Just rest your blonde girl locks my little lover boy and I'll make you feel better than you've ever been before." Marcy said as she sucked the last apple dry
Finn did as she requested and rested his head down for her to do whatever. The black marks were now all over her and she showed off her fangs for something big. She straddled her little hero and a chill formed across the house. The black blotches started to secrete from her skin and form a sphere around them, their view of the outside world completely shut out. Finn saw as her features peered in and out from normal to demon. Her body made crunching sounds and the red she ate looked like it was staining her skin from the inside. Thunder was heard and bolts of light struck the blackness. It looked like Marcy was going to force out her own skeleton. At last she stopped, her face sweating and the red melting back into her. They were in what looked like a maze laced with darkness, colored black but not obstructing their view. The ground felt smooth as glass but soft as silk upon gripping it. It was like a realm of just existence, no worry or need present. Finn was kept from asking any questions as Marceline started to kiss him. Unlike the other times they kissed, this one felt different. It felt like a deep connection was made beyond his body's primal urges or his mind's thought of love and lust. It was like their very souls were giving each other passion and satisfaction. As she raked and clawed him it felt like pure joy shockwaving to his center of pleasure. He could feel as her more demon features rubbed and nuzzled against him before inserting him into her.
"This'll be fun." Both thought as Marcy began
Both experienced some ridiculous but fun settings more their sex and love, and even with the alternative reality plain THIS was the weirdest but most enduring scenario yet. Every thrust and movement felt like an out of body experience, every thrust and kiss like another plane of bliss separate from the physical or even the astral plane. It was a world beyond thought and understanding, just joy and pleasure for them to share. The darkened background seemed to become vibrant as their passion grew, almost like their love was breaking the world itself. Marceline was blushing so much it could be seen against the red she ate. Finn was feeling up and down her body, gliding his fingers on her back and occasionally giving her a little spank.
"Oh my glob, it's so good!" Both thought
Marceline was plowing harder now, the world peering in and out of existence as they went. Finn grabbed and started groping her breasts, getting a good handful and a firm squeeze to each mound. Marcy was so tempted to bite Finn from the feeling, but she held back as much as possible her vampire instinct. As they were going, finn noticed how Marcy was starting to look and act differently. Her fingers were clawed out, her fangs were slightly longer, her pupils were shrinking, her nose became bat like, and she started to thrust much more aggressively. This was the effect the realm had on her, making her more passionate and sex hungry. She still kept her humanity(which was good since he didn't have the benefit of an ancient spoon on him like Bonnie would), but it was clear she was craving more than red. She stood up and arched back a bit to tease Finn as she went, feeling him throbbing as her breasts were almost flying from her moving. He gave in to her desire and started to suckle one breast while groping the other. He added an extra touch by lightly licking the one he was sucking and pinching the one he was caressing. Marceline really liked it as she moaned loudly into his ear. Finn was starting to feel light headed from the world, this particular round more draining than what they've done before. Marcy had to teethe on her knuckle to keep from biting, her lust and hunger being as strong as a ravenous predator. Both were about to reach one hey hey of a climax, finn reaching one hand down and grabbing her butt. Marcy started to kiss Finn to keep from biting him, using her list fulfillment to fight back her instincts. Finn was thrusting back at her, making the word start to rumble and distort more and more. Marceline pinned finn down and went with every bit of demon power she had. She felt herself almost choke and both felt their entire body halt for a brief second of time, it was happening. Both came with such force that it could rip their insides apart, Marcy feeling the best one of her life. Finn felt numb and dizzy, like he was falling under intense gravity. He just barely looked up and saw Marcy with her fangs far extended and more animal like than ever. He gasped as her instincts overtook her and she lunges for Finn's neck. In a fraction of a moment, everything came back to them. They were back on the couch, finn was panting as he just barely dodged, and Marcy regained her posture as her fangs were stuck in the couch cushion.
"Wha, oh my glob." Marceline said as she pulled her fangs out
She slowly reverted to normal and blushed at finn for what she almost did.
"Finn I'm so sorry, I just felt so rabid and went nuts there." Marceline said with an embarrassed look
"It's fine, I kind of fight things like that for a living, but what the glob was that inky place?" Finn asked
"Oh that, that was a shadow dimension that my dad had when we wore the amulet and I got it from him when he tricked me into wearing it. He said I could keep it given all the torture he put me through and that it's normally for torture and fist fights." Marceline explained
"Will he be okay with us using it for that?" Finn asked
"Psh, he hasn't used that place in years, it amplifies demon powers but you need a lot of strength to use it, and I thought a Boy Scout like you would handle it pretty well." Marcy said as she kissed his cheek
"Oh well, it was pretty intense, but fun to." Finn said
"Well we still got the rest of the night, you wanna go streaking and freak you some prudish fairies?" Marcy said with a coy grin
"Oh, uhhh, sure." Finn said blushing heavily
He grabbed his sword and the two floated(Marcy was holding onto him) to fairy village. Marcy giggled as Finn held his legs together
"I'm keeping us invisible till we get there, I know all those mad princesses would die if they saw you like this." Marceline said giggling
"Oh, well thanks." Finn said
"Your such a dork, but I love you for it." Marceline said
