Well, let's get it back on track then (although I'd rather have links to actual porn on this), so here's one of mine.
The class is having presentations, and an average-looking, very skinny redhead is standing in front holding a talk about the French revolution. She has a very monotonous speaking flow, and presents the topic in a non-enthusiastic way. The teacher stops her and comments on this problem, then proceeds to think about what could be done to help her. Somebody offers to get a coffee, but she doesn't like coffee and she can't drink while talking. Somebody else throws in "why not fuck her in the ass? that might excite her enough", and the teacher thinks that might work. Since I'm sitting nearest to her, I have to get up and behind her and pull down her pants. The teacher hands me some lube he took from a drawer, and I slowly start to stick one, then two, then three fingers up her ass. After the teacher asks us both if we're ready, she may proceed with her talk. I'm bending her over so I might get a better look of her ass, but she turns her head, looks at me condescendingly, and asks "how can I hold a presentation bent over?", so she gets up nearly straight and I fuck her in the as while she's talking. It does sound more lively this time, her speaking flow being hastened up and her breaths audibly deeper, and the teacher approves.
I get carried away, starting to really pound her ass, so it's starting to hurt her a little. She says "ouch", pushes me out and gives me an angry look.. the teacher just says "slower", and she positions her asshole in front of my dick again and spreads her cheeks. I slide in and fuck her gently, taking care not to cum because it's my job to keep her excited. After she's finished, she gets applause, we return to our seats and the next presentation begins.
