Crossdressing stepson receives cumshot from trans man

I'm not sure about the guy's sexual orientation, but he does have a nice ass. I mean, damn, that ass is juicy! It's so fucking hot! And he's not just any guy, he's my stepson. So, when he comes over, we like to play around a bit. He's got a nice ass, but I don't really know if he's into it. I mean, he's not into guys, but he's not into girls either. He's just into sex, I guess. Anyway, he's been trying to get me to jerk off with him. And you know what? I finally gave in. So, we're both naked, and he's got his back to me, and I'm stroking his big, fat dick. And then he starts to fuck me in the ass. It's not bad, I guess. I mean, he's not very experienced, but he's got potential. And then he cums all over my back.