"I don't really want to suck you off again, Jack," she says quietly, as she keeps lightly stroking my cock. "I want you inside me. I want you to fuck me, Jack.

I can't believe I'm hearing right. My twin sister, who I've been fantasizing about, as I spied on her through her window, is now asking me to fuck her delicious, young pussy. But I'm having second thoughts. If I fuck her, then there goes the reason for the blowjob lessons and her concern about letting Tony or other guys fuck her. I've been thinking that if she gave her boyfriends blowjobs, but didn't let them fuck her, she'd...