I taught my brother at a young age how to masturbate and we had done many things together. Things like, giving each other head and putting our cocks up against the jets in a hot tub, rubbing our penises between each others ass cracks and fingering each other. Funny thing is we both have no desire to do anything with guys but just each other.
During our masturbating escapades I would always hide my orgasms from him so my cum wouldn't scare him as I can sometimes cum pretty heavy and he never did release any sperm until we went on vacation.
My family went on vacation to a new resort in Florida and while the evening was winding down I wanted to go work out. My brother tagged along and after a short while I decided to go to the sauna and he joins me. We go to talking and finally he said I can produce sperm now. Since we hadn't masturbated together in about a year I told him to show me.
He pulls his cock out as small as it was then... you should see it now; I'm not gay but I would suck and swallow my brothers cum in a heartbeat. He begins to jack off. I noticed he still does the things I taught him; he was sitting up yet leaning back and beating his hairless cock with his right hand and fingering his tiny little ass hole with his left, every so often pushing down on his pelvis. He kept looking at me and biting his lip so I got the hint and took mine out. In unison we kept staring at each others hungrily and then looking in each others eyes.
As he got closer he kept his finger inside him and kept his eyes on me, I just wanted to reach over and do it for him but he was too close and as he was climaxing he told me "here it comes" and the tiniest bit, almost a droplet of cum comes out. I reached out and rubbed the cum over his head and then mine. As he was winding down yet still stroking and staring at me I told him I was going to cum and so I lifted my shirt b/c I knew it was going to be a ton and ejaculated all over my chest and stomach. His eyes got so big he said he had never seen so much.
However, this was the last time we masturbated together as I had my first girlfriend at the time and then time just flew by. But if he asked to masturbate again I would, any time.