"I've got one rule for tonight. Lay off my ass. I'm so sore I can barely sit, you beast." She rubbed her butt with her hand, as if she'd been spanked.

"What is it with you and butts?" Beth asked me.

"I don't know. It's just one more thing I like to do. There's something really naughty about having sex in the ass, and it sort of means the girl is holding nothing back. I don't know. It's different with different people." I confessed.

"You've never touched my butt, Jack." Debbie said.

"With you, it's not your ass you're holding back. I know that you'll give me your body unquestioningly;...