Fooled around with my younger brother a lot when we were teenagers.

Started with us just jerking off together. He was always way more interested in my dick than in the straight porn lol. So I let him touch mine. It didn't take much before I had him going down on me.

That quickly became a regular thing. Just blowjobs at first, but after a few months I started fucking him too.

I was a selfish asshole about it... barely ever did anything to help him cum, just treated him like a cumdump whenever I was horny, and acted like I was doing him a favor. He'd jerk himself off when he blew me, and would usually cum from getting fucked too, so I felt like I didn't need to do anything more to help him get off.

He got annoyed with my attitude sometimes, but put up with it anyway. I was never sure if it was cause he really liked my dick despite me being a jerk about it, or just cause he had no options for sex at that age.