My brother's friend reaches orgasm through my intense movements, leaving me exhausted and disinterested in sex

I'm not exactly thrilled about my brother's friend, but he's got a pretty decent body and a nice cock. So when he came over the other day, I figured I'd give him a quick ride. We started off with some cowgirl action, my favorite position, and it wasn't too bad. He's not exactly the most enthusiastic guy, but he's got some skills. Anyway, we kept going for a bit longer, but I was getting pretty tired. I mean, I don't get much action these days, but damn, that guy is really making me work for it. I don't think I've ever been so exhausted after messing around. Anyway, I guess he managed to get off, but I'm not really sure. To be honest, I'm not even sure if I want to see him again. I mean, he's not too bad, but I don't really have much in common with him.