One day, my childhood friends, Riku and Hinako, suddenly showed up at my house. They started rummaging through my room without permission... and when they found my porn magazines, they were super excited. I thought they were just messing around, but then they suddenly got serious and looked at me... "We're friends, so we have a favor to ask you," they asked. "Can you show us how boys masturbate?" My sexually curious 'friends' asked me to masturbate in front of them...