SONE-626 — "She's Shy, Timid, And Weak To Pressure" I Was Attracted To My Girlfriend's Sister, And I Secretly Had Sex With Her. I'm Such A Terrible Person.

[The troubled face of the weak-willed Mita Marin is so cute it's precious...] Marin is a timid and timid girl. Although she is not aware of it, her appearance and mannerisms strike a chord with men, making her popular. She is given a tutor. It is Atsushi, her older sister's boyfriend. He has a problem. Even though they have been dating for quite some time, Marin's older sister is a strict person and won't let him have sex with her at all. Compared to her strong-willed older sister, Marin seems weak and easy to get. Atsushi, whose desire was about to explode, made a move on his younger sister. However, Marin... accepted. When Atsushi found out that she was weak-willed, his desire escalated more and more...