When I was about 13 I told my older sister that I thought I might be gay. She asked me if I had ever sucked a coc before. Quite embarrassed, I said that I had sucked a cock. After a few minutes she said that she would like to hide in my bedroom closer and see me sucking another boy's dick. It never happened but I think always think about how thrilling it would be to suck a dick while she was there watching my mouth filled with a cock.