My first sexual experience was with a cousin. I was around 12, he was around 14. I believe he's completely straight, but being the cock son of a bitch he is, he enjoyed teaching me how to be a cocksucker and feeding me his loads. I was a pretty sheltered kid, and every time I think about our first time I get boned up. We were in his garage and he pulls out a stash of Playboys, then starts telling me what it's like to cum (I had never even masturbated). One thing led to another and he became more comfortable showing me his cock, then asking me to touch it and eventually asking me to lick it.
We lived a couple hours from each other and would only see each other maybe once or twice a year. Each time my mom and I went to his house, I would service him at night. I was amazed at what a large, hard cock felt like (I was a late bloomer and he was hung for his age).
Good times.