Wish I had a boyfriend that wore panties

I was 25 and living with a friend and her boyfriend also lived there. I walked into his room to borrow something and saw him laying on his stomach in a pair of pink bikini panties which were not mine so they must of been my friends. He had his hand under him and was really stroking it. He did not see me for about 5 minutes, then he saw me and said sorry. I said thats cool please keep doing what you were doing and watched him finish. His butt looked so sexy in those panties. I respected my friend so I never did do anything sexual with him but watching him jerk off in panties that time was such a turn on, made me wish I had a boyfriend that wore panties.