It happened when my older brother got home from his holiday in philippines. (My is 10 years older than me and we weren't all that close, but this made us closer.)
When he got home we were getting really to move houses, so everything in our room was packed up so we had to sleep in the same bed. so in the middle of the night it was getting quite warm( australian summer)so our clothes were minimising quickly.so while getting back to sleep I felt that my ass was getting massaged, then realised th at it was my brother. at first I was nerves but 3mins in to it I got in to it. I was getting really hard and horny by that time. then I turned to face my brother, with his hand still in my shorts. his hand then rotated around to my front and he started rubbing my balls. at that time I felt like exploding right there.
so to return the favour I slid my hand down into his jewels and rubbed them good. this went on for 5mins then my brother made the first move he grabbed my erected penis with one hand and took my shorts off with the other. at first he said 'do you want to?' as you do I said yes. so he continue to wanking me slowly, up and down my 5.5 inch dick. god it felt good. it made it event better when he got on top of me and took his clothes off. i'm straight but there is something about a treamed guy that turns me on.so anyway his there jacking me off like there is no tommoro. I looked down at he and saw that he was getting the biggest hard(7inchs) on which he also was wanking.so I grabbed his dick and jacked him hard. we were both breathing heavily and sweating alot. it was almost time cum when we both yell out an huge moan. our cum shot all over our abs and balls. it was the greatest wank off I have ever had. that night we slept naked on top of each other.