His sister!?

"How about you and your sister, well, you know?" Jenny says to Adam suggestively, shocking him. He was expecting something bad, but what's coming out of her mouth seems worse than he imagined. He opens his mouth to object, but-

"What!? That's ridiculous, of course not," Cassie says. Adam breathes a sigh of relief. At least she's on his side. "I would never -"

"Well, I know you have problems with your car payments," Jenny interjects. That's true, Adam thinks, his sister is always behind on her bills. "You know, if you win, maybe Adam's GIRLFRIEND here will make them disappear." she says, winking.

Damn it, Adam thinks, looking at his sister ponder the suggestion, she's really considering it! He wants to back out now, but he's already too far in...

"Deal!" Cassie says! Adam is really concerned now. Oh shit oh shit oh shit oh shit he thinks. This is not going well. "What do I have to do?"

"Simple," Jenny lays down the rules. "Whoever makes the other come first, wins."

Adam sees Cassie sizing him up. This can't seriously be happening. "No no no no no." he says, but neither of them pay attention to his objections.

"My bedroom." She says decisively, grabbing him by the arm to lead him. Adam follows instinctively, too lost in his own thoughts to object. Where did it all go wrong? He had the perfect plan.

Behind them, Adam sees Jenny is grinning ear to ear as she follows them into Cassie's bedroom. That bitch is gonna get it! He thinks angrily. He can't believe she convinced his own sister to fuck him for cash!