Papyrus dumped Sans on his bed, then knelt over him, unbuckling his belt. He watched as Sans's face turned to one of complete fear and horror as his zip came down, releasing his throbbing cock.

He gripped his length, teasing it along Sans's folds and making him squirm. "Oh god. Oh god. Papyrus pl-please, please don't do this to me." Sans sobbed, covering his mouth to smother a moan.

Papyrus smirked, his eyelights still glinting dangerously. "What?" He scoffed. "Are you scared?" The idea of a concubine, scared of sex, was so preposterous that he had to hold back a snort.

"Y-Y-Yes.." Papyrus paused his motions, shock flashing across his face. "You're.. afraid of sex..?" He asked, bewilderment saturating his expression.

Sans blushed an even darker purple. "..I haven't told anyone.." He whispered, a tremor to his voice as he looked up at Papyrus with fearful eyelights.

Papyrus knit his eyebrow ridges, his gaze scrutinizing. Sans winced under that gaze. "And why would you tell me?" He said, tone sharp and harsh.

Sans looked up at him, and Papyrus saw something else in that expression besides fear. Sadness. "Because I trust you. Because I love you." His expression showed that he thought himself a fool for still feeling this way.

Papyrus swallowed, doubt suddenly flashing through his mind. What was he doing? He was hurting the person he loved. He shouldn't be doing this.

But when he thought of WHY Sans felt this way, his soul twisted with contempt. "You only trust me because you think you're my brother." He snarled, prompting Sans to flinch back. "Well, do you think you can still trust me after THIS?"

And with one solid thrust, he sunk his dick all the way into Sans. Sans screamed in shock and pain, face contorting into a conflict of emotions. But Papyrus didn't give himself time to read into them as he immediately began to set a brutally fast pace, the slick sounds of his length entering and exiting Sans filling the room.

Sans wailed, tears springing up anew as he screamed into the emptiness of Papyrus's room. His hands gripped the bedsheets so hard that his bones creaked, his whole body shuddering under Papyrus's thrusts.

"A-Ahhh!!" Saliva dribbled out the side of Sans's mouth as he screamed, his violet eyelights rolling up as he came hard around Papyrus's length. But Papyrus never even slowed his pace, continuing to fuck right through Sans's orgasm.

Papyrus was surprised by how quickly Sans had reached his climax, but he wasn't going to stop until he was able to satisfy himself. "Why don't you beg me to stop in that pretty voice of yours?" Papyrus purred, relishing in the dark purple blush that covered Sans's face as he took in Papyrus's words.

But he didn't beg. Not even when he came a second time, the pain obvious in his eyelights as he sobbed over Papyrus's brutal pace. It wasn't until Sans's third orgasm when Papyrus was finally brought over the edge, filling Sans with his cum as he came with him, his own voice crying out alongside Sans's.

He pulled himself out of Sans, exhausted from how harsh a pace he had set. Sans lay there, breathing hard as both his own purple cum and Papyrus's pink cum dribbled out of his pussy.