The 4th exclusive release! Nana Yagi's first drama challenge! The electricity and gas were cut off at my house, so I decided to stay at my girlfriend's house for a while. She has a younger sister, and this is the first time we're meeting her... She pops out from behind her back and seems wary of me. "Nice to meet you, I'm Nana," she says shyly in a thin voice, and it seems she's an innocent girl who isn't used to men. She's too weak to resist pressure and can have sex right away, so she's a sensitive, trembling, premature ejaculator! I've been fucking my younger sister for a week without my girlfriend knowing!