Is it normal that i masturbate with my best friends moms panties

I slept over my best friends house, which I frequently do. Well that was the day of the week I usually masturbate on, so I was very horny. I set my cell phones alarm to 4:00 am to go masturbate in the bathroom. When I walked through the hallways I saw the pictures of my friends mom. I was always attracted to her and then remembered they have a laundry shoot. I slowly and quietly went to the basement to where the laundry empties. I then began to dig through the clothes until I found the greatest thing I have ever seen. His moms panties! (It was a blue, see through pair) I immediately got so hard and began to sniff them. I masturbated right there, with her panties in my hand and came all over. I took them home and sniff them everyday. Every time I go to his house I find myself uncontrollably hard and trying to find more of her panties. When I go back over their I switch the old pairs for a sexy, new, fresh pair.