I fantasy about my best friend, i dont know why, we grew together and we're like brothers. Hes so fucking hot but im not in love with him in an emotional way, he also has a girl friend, and im trans so its kinda impossible. One Day while we were on holidays (we were vacationing out of town but in different houses each family) i went to his house and his family welcomed me on the living room telling me he was showering. So i thougt i could smell his under wear when he finished showering if i was Lucky. And i was! I entered the bathroom with 0 hope but behind the Door he HAD forgotten his boxers. I locked the Door and smelled them. They were not stained or super stinky, but i came really fast. I wish they were cummed, as a cum rag. His dick is 17 cm, but i never saw it. I know he does not like having sex buddies or friend with rights and im Just his friend, however i feel some tension between us, what should i do? Any tips on how to have something sexual with him?