Terezi blushed deeply as she lifted her ass in the air, and pushed down on Karkat's bulge, feeling it push into her behind. Once the length of his bulge was in, she sighed, and grinded softly on Karkat's hips, a smile growing on her face. Karkat grunted in response, feeling around inside Terezi, his bulge throbbing, stimulating itself, growing used to its environment, as it squirmed around inside her, making sure she felt comfortable.
Terezi cackled and lifted her buttocks softly in the air, and then thrusting down again, Karkat's breath swooshing out as he felt a wave of pleasure fill over him. He grunted softly as Terezi did the same thing again, his bulge throbbing more intensely, Terezi moaning a bit, feeling his bulge grow and push up more and more. She grinned and cackled, quickening her pace, feeling Karkat underneath her, getting stimulated and shaking softly, every movement a tense reminder on his current situation. Terezi lifted her ass high, off his bulge and let out a loud breath of air, turning herself back to face him. She brushed her seed flap deeply against Karkat's bulge, making Karkat bite his lips again, his bulge flailing; his face blushed over in an intense shade of red.
"SO, K4RKL3S, YOU 3NJOY1NG YOUR G1FT?"
Karkat shut his eyes as he felt Terezi's seed flap tease his bulge, Terezi's hips grinding up against his own, her seed flap leaking out genetic material slowly, pooling at her base. Karkat nodded as he felt Terezi's hands stroke his bulge, and grab it forcefully.
"GOOD. 1 HOP3 YOU 3NJOY TH1S N3XT P4RT 4S W3LL," she cackled, one of her hands fingering herself and pulling her flap open wide, her other hand with Karkat's bulge, shoving it inside of her, her flap wet and dragging on his bulge. Terezi pulled her thighs together, her flap constricting up on his bulge, making her gasp and moan, shuddering softly against her. Terezi blushed and cackled loudly, a hint of pleasure deep inside her laughter. Terezi opened her thighs and closed them back again, listening to Karkat's moans grow louder, as she felt his bulge writhe and throb deep inside her uterus, spreading out her walls, making her thighs spread out a bit more than before. She ran her hands down her body as she felt a pressure grown inside her. Terezi threw her head back and called out Karkat's name as she thrusted her hips fiercely, her speed increasing as she spread her legs out again. Karkat moaned loudly and thrusted back, his bulge squirming more than ever before.
Terezi came quickly, her teal genetic slew lubricating Karkat's red bulge, which was throbbing intensely and writhing more than ever before. Karkat grunted loudly and swore, finally cumming, his red genetic material flooding through her, filling her uterus up. She cried out softly in pain as she felt a heavy weight dragging down on her, Karkat cumming a whole bucketload into her. Karkat's bulge writhed out and Karkat sighed, panting heavily from the experience. Terezi rubbed her seed flap calmly, massaging herself as genetic material pooled out on the bed, and on her thighs, and his thighs. She sighed and cooed softly as she lay down on top of him, her body still tensed up, but her form still soft, resting against his. They kissed deeply, their tongues rolling of eachother, their bodies close in the heat of the moment.
"shit, lets be santa" Dave said as he walked away from Terezi's door, shaking his head and snickering quietly to himself, who had appeared at the door, hearing screams. It did get him laid in the end, he remarked. Totally laid.