Michael keeps watching.

Michael's breath caught in his chest. He couldn't believe what he was seeing. He knew that Jean liked to party. He had always gotten made fun of in school for having an older sister who got around. But this... this was way beyond just partying, way beyond 'getting around.' This was something radically different, and Michael had no idea what he was supposed to do. He had no idea what he could do. So, paralyzed by indecision, Michael stood and stared through the crack in the door, barely even breathing.

Jean groaned, throwing back her head as her body squirmed. "Oh my God, Jon," she said. Her eyes were rolling back into her head. If Michael didn't know any better, he might have assumed that his sister had been possessed by a demon. A little part of him wished that that was what was actually happening here, but he couldn't pretend that Jean wasn't in her right mind.

Jon grinned, red in the face. "Spank her," he snarled at Cassandra, still playing with the blonde woman's pussy.

Cassandra raised her hand and brought it down on Jean's ass cheek. That only made Michael's sister moan louder, on top of the fiery-bright mark that the slap had left on Jeannie's ass.

"Tell me that you're his slut," Lily ordered, grabbing Jean's head by the hair. Lily's pale white hand snaked under Jean's stomach. By the way that Jean's lips pursed as soon as Lily's hand had disappeared, the dark-haired woman must have been playing with her clit.

"Oh God!" Jean said, her teeth grinding against each other. "I'm his fucking slut!" God, that was so much worse than hearing Jon say it. For Michael, hearing his sister declare herself to be some random man's slut with another woman's fingers between her legs... Hell, he didn't know how he would ever be able to look at her in the same way again. In his mind's eye, she would always looked like this. Bent over, breasts squished against the tub, eyes rolling back, defiled by a strange man and his two groupies. Or did that just make Jean his third groupie? She was the one whose pussy he was using, after all.

"Fuck yeah!" Jon declared, pushing himself hard and deep inside Jeannie. He grabbed Cassandra by the neck, and she smiled, just as he brought her in for a sloppy kiss. When the two pulled apart, they pressed their foreheads against one another's, grinning and struggling for breath. "Spank her again!" Jon said.

The clap of Cassandra's hands on Michael's sister's ass filled the room, and it echoed between his ears. Jean squeaked with pleasure.