JAV Tokyo

My sister rents me as a pseudo-brother to her girlfriends who don't have a brother! My role is to give my sister and her friend everything they would want to do if they had a brother, including taking a bath together and sleeping on a futon together. But we're both adults...and I get all kinds of erections when I bathe and sleep with my brother! But my sister and friend seem to love my erection, and they crossed the line, and it was only supposed to be a one-night stay, but it was going to be a long overdue one! To be honest, she is 100 times better than my own sister! She is kind, erotic and....