Little cousin is pretty big now
When I was 15 and my little cousin was 13 I showed him some porn (male-female) we were both wearing shorts and he noticed I got a massive boner, without saying anything he touched it as a joke. It felt amazing! I had shivers so I asked him to squeeze the tip which he did and I showed him some more porn.
After a couple of more scenes I couldn't take it anymore so I lowered my shorts a bit and showed him my dick. He looks and kept saying oh my god that thing is huge it's not normal now I'm about an average six inches so anything seemed huge to him. I wanted him to masturbate me but someone came home so we had to stop.
Time passed and he would randomly feel me up a bit sometimes for a brief second which I didn't mind at all I'm into girls but who doesn't mind a quick feel. We stopped about a year or so later and now he is 18 about my height 5'7" pretty built strong muscular arms nice strong chest.
So today the topic of masturbating came up and well he was wearing shorts and I could see as his penis was starting to get semi hard and let me tell you it was pretty big I kinda wanted to return the favor he did for me all those years ago, hopefully in a day not too far from today I'll ask him if he wants to masturbate
I'm sure with the right convincing we will do it.