My girlfriend's younger sister was taking a shower without a bra, which made me unable to stop myself from getting an erection. After that, I was seduced and continued to ejaculate inside her. (Aozora Hikaru STARS-326)

I was living with my girlfriend in Tokyo. During winter break, my girlfriend's younger sister, Hikaru, who was still a student, came to visit. One day, I caught her without a bra, completely defenseless, which aroused me, as I hadn't had sex in a long time...