While his girlfriend was away, he secretly began living with his sister, who suffered from premature ejaculation and was bad at saying no, for seven days. (MIDE-751)

My house was without power and gas, so I'm temporarily staying at my girlfriend's place. I saw her younger sister, Nana, who's introverted and shy and doesn't know how to refuse men, which led to me losing control of my bladder and reaching orgasm during intercourse!