You Give the Best Head? Prove It, and I'll Be the First to Fuck Your Ass

My dad's best friend has been staying with us because his girlfriend kicked him out. Apparently, he wanted to fuck her ass, and she was not into that, so here he is. He tried to explain the situation to me, but I've never done anal, so I didn't understand what the big deal was. It's not that I wasn't curious, but most guys think I'm one of them just because I'm a tomboy. That doesn't mean I don't like cocks and fucking. Hey, at least I've been told that I give the best head. The second I said that, he wanted me to prove it, so we made a deal. I'd give him the best blowjob of his life if he fucked my ass.