The other day I walked in on my brother and his friend in his room. They both had their hands round each other's cocks and were wanking. They told me to get out.
My brother used to tease me with his cock when we were younger and I didn't have any hairs round mine. He used to show me his cock and he even wanked off for me, to show me what cum looked like. I am glad that he taught me how to wank.
So I have seen my brothers cock loads of times, but seeing his mates really turned me on. I went to my room and really pulled myself off remembering what it looked like, all veiny, with a purple mushroom shaped head.