Your sister's break-up has been really hard on her, so she asked to come over and hang out. Of course, when she asks you to lay on the couch and cuddle, you don't think its too weird. I mean, you did it all the time as kids, right? And she's having such a hard time...but when her hand starts to snake down to your crotch, rubbing at the mounting erection in your pants, you realize that this isn't as innocent as you thought.