(A few days later)

Lust swallowed as he watched Papyrus approach him with the prowl of a predator. He trembled slightly, looking up at Papyrus as he finally made it to the bed. The fear was reflected in his eyes.

"Just relax.." Papyrus murmured, pulling Lust toward him. Lust's breath started to quicken as he stared at the predatory gleam in Papyrus's eyes.

Papyrus leaned down, separating Lust's legs, despite his whimpering. He began to rub circles all along the insides of Lust's thigh-bones.

"Mmm!?" Lust gasped unexpectantly at the wave of pleasure that flowed from Papyrus's fingertips. He closed his eye-sockets, sighing.

Wait, no. He couldn't give in. Lust wrenched his eye-sockets open to see Papyrus watching him with an amused, yet pleased, expression.

He stuck two fingers into Lust's opening, making him gasp. He moaned ecstatically, bucking his pelvis toward Papyrus.

"Nghh.. H-Hah.." Pleasure was making Lust's mind blank out. He wanted more. He whimpered, straining towards Papyrus again.

Papyrus looked down at Lust. He was panting heavily, his face dusted with a faint purple blush.

Lust reached up, wrapping his arms around Papyrus's spine. His eyes were dazed as he panted, pulling Papyrus down for a kiss.

Papyrus's eye-sockets widened in surprise. Lust never showed affection in any way towards Papyrus, even when he was being fucked. But now, Lust tangled his tongue desperately with Papyrus's, the kiss becoming even more intense.

Papyrus smiled in the kiss. The potion was working! Lust couldn't suppress his sexual desires any longer. All living beings had this desire within them, but it seemed as if Lust was able to fully control his emotions 100% of the time. But now, the potion was making it impossible for him.

Lust huffed, his eyes taking on a dazed look. He smiled softly up at Papyrus, arching his back so that his ribs touched Papyrus's.

"Please.." He breathed, his eyes still managing to smolder even with the dazed look. He ran his tongue lightly over his teeth.

Papyrus reached down to unzip his pants. Then, positioning his own red member at an angle to Lust's opening, he thrust the entire thing in. "Hhh-HAH!" Lust shivered as the pleasure rolled down his spine. It was making his mind hazy, and all he wanted was to get closer.

In a small recess of his mind, Lust felt that something was wrong.

Something was off about this situation, like he shouldn't be doing this. He should stop, pull away. This wasn't right. But the pleasure was clouding over his mind. He couldn't think coherently.

As Papyrus began to pick up the speed, Lust could hear his own cries saturate the air. Everything blanked out as he gave over to the pleasure.