A college jock with a massive cock decides to test out his stepsister's new lubricant, unaware that she's in the room next door. He begins to stroke his thick, veiny cock, lubing it up and moaning in pleasure. His sister, overhearing, becomes curious and peeks in to watch. She's never seen a cock that big, and it's driving her wild. She can't help but touch herself as she watches him, her own pleasure building.