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

Exclusive 4th installment! Yagi Nana's dramatic debut! My house lost power and gas, so I'm staying at her place for a while. She has a younger sister, but this is our first meeting… Her face pokes out from behind her sister, eyeing me warily. 'Nice to meet you, I'm Nana,' the younger sister says in a soft voice, blushing slightly. It seems she's inexperienced with men and very pure. She's so easy to push over that we can have sex right away—she's sensitive, twitchy, and comes quickly! A week of non-stop sex with her sister none the wiser!