She barges in the next day

At nine O'clock Adam hears a sharp banging on his door and so he goes to answer it. When he opens the door standing before him is his sister looking very much like the stereotypical butch lesbian with: short,dark hair; small (perhaps B-cup breasts); a small cute rear and last of all wearing a glowing smile. While Adam is giving his own sister the once over she grins knowingly at him and barges into his apartment.

"Well brother I guess we always knew that you were always going to be my first"

She says still smiling after an awkward moment of silence

"Your first?" Adam responds confused, he knows for a fact that his sister has fucked several bimbos, he is certainly not her first.

"Not my first fuck silly, my first one to bring down. You have no idea how hard it is to find even a relatively unused slut willing to be used by a stranger, all the ones I've found so far have been completely used up bimbos, so used as to be un-fuckable and I've barely moved up at all because of it. Then I get your e-mail, ooh the things I'm going to do to you..."

Adam then simultaneously notices two things: the damp patch between her manly trousers and the hungry expression with which she was eying his body.