No

Adam needs to take control of the situation fast - or he's gonna be the one coming in Cassie's cunt soon. He's rapidly losing control and Cassie seems to have more stamina than he thought.

Adam tries to flip the position and push Cassie on her back - but somehow she anticipates the move and stops him, slamming him back down on the bed. Shit! he thinks.

"Nuh-uh." Cassie says, seeming to be back in control. "I don't think so."

Desperately, he tries to push her off and roll away, but she sees this coming too, grabbing Adam's arms and pinning him down and she jackhammers faster and harder on his cock, bringing him closer and closer to climax.

"I know you better than you think," she says, grinning.

"Fuck" Adam moans hard. "I'm gonna come!"

Cassie leans in and whispers in Adam's ear. "Yes," she says "come for me."

"Fuck! No no no no no" Adam shouts as he comes hard, spurting several streams of cum inside his sister's pussy.

"YES!" Jenny yells in glee as Cassie triumphantly towers over him. "Time to punish this loser, don't you think?"