SDMUA-045 "She still thinks I'm a virgin." Her younger sister, who has bigger breasts than she (20) does, seduced me multiple times, and I ended up having sex with her and finishing inside.

Film Introduction

For the first time in my life, she was my college classmate. She hasn't done H yet. Her younger sister Erika is going to take the exam next year, so I, who is good at math, decided to be her tutor. It was a lighthearted feeling like "I'm lucky to get a part-time job and go to her house", but her younger sister Erika teased me as a virgin and seduced me by showing her boobs...