Guys Wearing Panties Turn Me On

When I was 17 I stayed over at my friend's house who had moved to a different town. I was there for a week. She had a 15 yr old brother who I thought was hot. Well one day I had taken a shower. I finished and went to my room. After about 30 minutes I realized I had left my panties and bra in the bathroom. I went down the hall and the bathroom door was open a bit. I peeked in and there he was in my panties with a big hard on. He looked so hot standing there looking at himself in the mirror and stroking it. I watched him cum in them. I went into the bathroom after a while to get them and they were on the floor. Later that day I said to him would you like to keep them. He said keep what? I said I saw you in the bathroom wearing my panties. He got all red and could not say a word. I left them in his room for him. Since then watching a guy wearing panties always gets me so turned on.