MIDE-751 While my girlfriend was away, I secretly fucked the easily overwhelmed premature ejaculator sister for seven days while cohabiting

Exclusive 4th edition! First challenge to Nana Yagi drama! My house had no electricity or gas, so I decided to stay at her house for a while. She has a younger sister, and I'm meeting her for the first time, but... she seems to be wary of me, sticking her face out of her back. “Nice to meet you, Nana,” said her little sister in a shy voice. Sensitive Bikubiku premature ejaculation daughter who is too weak to push and can have sex immediately! A week of fucking with her little sister without telling her!