Ever since I was young, my sister would touch my crotch to calm herself down. Even now that she's an adult, whenever she feels anxious, she comes and touches it. If you keep touching my dick like that, of course I'm going to get hard! "Don't make it so big," she says while not stopping her touching. One day, I said, "Sister is being unfair. Let me see too," and she shyly showed me her naked body and let me touch her. Seeing my sister's naked body for the first time made me extremely excited and fully hard! Furthermore, my sister got excited as well and forced me into a riding position, making me ejaculate and release semen inside her three times in a row!
