Adam accepts the challenge

The three of them enter Cassie's bedroom, Nathalie still tied up in Adam's. Concerned, he realizes she's been waiting for over 15 minutes now - probably wondering where Adam's gone.

"C'mon, Adam. You know how much I need the cash. Just forfeit." Cassie says. "Then we won't have to do anything."

"She's right, you know," Jenny adds, grinning evilly. "You don't have to do this."

Adam feels a twinge of guilt. He knows his sister really needs the money - but he can't give up, especially with so much on the line. He needs to teach Jenny a lesson - give her a taste of her own medicine.

"No," he says firmly, taking off his shirt over his head. "We're doing this."

"Oh, it's on," Cassie replies, her voice wavering slightly as she strips too. She's trying to appear confident, but Adam notices her hesitation as she takes off her bra. Her perky breasts poke out and Adam can feel himself getting hard already.

"Wow, that was fast," Jenny asserts. "Looks like someone can't wait to lose."

"Shut up." Adam replies, beet red, as his sister takes off her panties, revealing her perfect pink pussy lips. Adam feels more aroused than ever. She's your sister, goddamn it! he thinks, but all that does is make him even harder.

Cassie beckons him towards the bed a little uncertainly. He approaches confidently. She doesn't seem too sure about herself, he realizes. I can probably finish her off before she gets herself together.