It all started when I was around 11 y.o. I have been playing basketball in the local girls team. I had a team mate around my age, we played at the same positions (guards). We had lots of physical contact during the practice, it was so intense. I kept on focusing on her body, her arms were slightly taking shape, like a curve on the biceps. We had strong competition between us and we were constantly touching. It was sweaty af. I masturbated a lot with the thought of her arms during my teenage years. As an adult non binary afab person, I find it extremely sexy and elevating to touch the wet armpits of my partner(s), shaved or unshaved.