Fionna wrapped her arms around Marshall and rested her head against his. "Can you take me home now?" She asked. "I wanna see Cake," Marshall felt a slight sense of disappointment, but nodded and picked her up off her feet, making her laugh. He opened his window and flew out with her in his arms. Minutes later, he arrived at the treehouse. Fionna hopped out of his arms and knocked on the door. Cake opened it and almost passed out at the sight of Fionna's bite marks.

"OH MY GLOB FIONNA! WHAT DID THAT CREEP DO TO YOU!?" She screamed. Marshall just rolled his eyes, and put his arm around Fionna's shoulder. "Nuh-uh," Cake exclaimed. She then jumped onto Marshall's shoulder and stretched out around his neck.

"What the junk Cake!" Marshall hissed, his eyes turning red. Fionna pried Cake off of Marshall and brought them both inside, shutting the door behind her. Fionna had no idea what to say to her.

"Look, Cake, I know you're upset- but he didn't mean to, and it's not his fault. So don't blame him," She explained awkwardly. Cake rolled her eyes and slapped Fionna cold across the face. "What the heck Cake!" Fionna screamed. She grabbed Marshall and pulled him upstairs, sitting him down on her bed.

"Glob Fionna... I'm so sorry, I'm such a prick," Marshall sighed. His eyes then began to water, and he hid his face from her; trying to be as least vulnerable as he possibly could.

"Marshy, please please don't cry," Fionna begged. "I love you, please..." She sat on his lap and hugged him tightly, pulling his chest close to her. "C'mon Marshall... where's that evil Vampire King that I'm used to?" Fionna whispered. "It must be in here somewhere..." She teased, pulling at the top of his shirt.

"Fionna not now," He complained. He turned over in her bed and crawled under the covers. She absolutely hated seeing him like this. "Marshall Lee, the Vampire King, I love you. And it's a privilege to become a part of who you are," She whispered.

"Oh, the things you do to me, Fionna," He chuckled. Marshall pulled her close to him and kissed her repeatedly with passion. He groaned quietly, and pushed himself on top of her. From his hands groping her in different areas, tongue going crazy exploring her mouth, grinding his completely his hips against hers, she felt like she was going to lose it. Her fingers tangled in his mess of his thick, black hair, making him moan. She could feel herself getting more and more wet by the second. He pulled away and lifted himself to take off his shirt. As he was in the process of his shirt she sat up and went straight to his belt buckle. After his shirt was off he took her hands off his pants, un-buckled and un-zippered, and pushed her back onto the bed. "It'll hurt less this time, Fi," He murmured. "Feel a lot better,"

"I don't know if that's possible," She teased.

Marshall smirked and moved down lower, attaching his lips at her collar bone, reaching his hands under her and impressively, un-clasping her bra. Once the bra was off he made his way down the valley of her chest, and then, moving to each nipple, giving each his full attention after another.

"M-Marshall" She moaned.

He made his way down her torso, just above the rim of her black lace underwear. He slowly pulled it down, taking it completely off, and, about to spread her legs and lower his head into her, she stopped him and pulled him back up. She flipped him over and glided herself down to his pants. She pulled down his pants, leaving him in his tight boxers. She traced her fingers on the outline of him, teasing him some more.

"Don't tease" he whimpered, sticking his forked tongue out and licking his lips.

Fionna obeyed and pulled his underwear down, she grabbed his hard on and brought her lips close, hovering the sides, tracing her fingers against the veins that popped. Just as she brought her mouth closer and about to take him in, he let out a frustrated groan and pulled her up, flipping her onto her bed and positioning himself at her entrance.

"Ready baby?" he asked as he looked into her eyes.

She bit her lip and nodded as he slammed his whole self, right into her, giving her little to no time to adjust.

"Glob, MARSHALL" She moaned.

He pulled out almost all the way before slamming right back into her, hitting that one spot she loved.

"Fuck," She groaned, "Right there!"

He took her left leg and hung it over his shoulder and, lowering himself down more than before, hits her at a different angle. He repeated his action of almost pulling out to coming right back and slamming into her. "Right there, baby?" he asked, groaning at the same time.

"Oh yes, yes Marshy," She yelled as he hit that spot repeatedly. Since at a new angle it gave her a completely different pleasure.

"Shit" she moaned, "Don't stop, don't fucking stop!" She said as he picked up the pace of his thrusts.

He lowered his head into the crook of her neck; she could hear him softly groaning her name repeatedly. His teeth were lightly grazing against her neck, tongue slipping out his mouth and swirling around the two bite marks he caused. Fionna removed her hands from tightly gripping the sheets and tangled them into his hair, tugging at it so he lifted his head up to look at her.

"Harder" She whimpered.

He obliged and slammed into her harder.

"Scream my name baby" he moaned.

"Shit Marshall…" She moaned as she felt her stomach twisting.

"Louder" he growled"

"FUCK MARSHALL!" She shouted as she clenched around him and released herself onto him. Marshall pulled out and positioned himself on top of her, about to cum. Suddenly, they heard the door fly open and Cake was standing there, not paying attention to Fionna and Marshall.

"Fionna are you okay?! I could hear you yelling all the way from downstairs and I-" She looked up at Fionna and gasped. "MARSHALL YOU GET OFF HER," She screamed. Marshall's face quickly turned a deep shade of red and he could feel his cheeks burning.

"Oh... oh my god, Fionna, I'm so... so-"

Fionna got up and ran into the bathroom, tears streaming down her face. Marshall pulled his clothes back on and flew out the window back home. Fionna could hear Cake banging on the bathroom door from outside.

"Fionna, talk to me!" She begged. Fionna was sitting against the wall on the floor of the bathroom, curled up in a ball and her face covered with tears.

"I- I didn't know you were home, Cake, I'm so sorry..." She opened the door and let Cake in, but, expecting to see an understanding and "I'm sorry, Fionna" look upon Cake's face, she saw complete horror.

"Fionna, you have FANGS!" Cake cried.