A tutor who acts like an adult, and sex seduced by "cousins"! And instead of getting angry after witnessing the sex scene, the cousins start paying attention to me... MIMU-010

When my "sisters," who were tutoring me to prepare for exams, came to visit relatives after five years, I found myself being unsuspecting. While tutoring the younger sister, Natsume, she inadvertently seduced me. The problem is, sex between relatives can be complicated, yet she still actively sought me out! Seeing my sister like this, I told her I'd be angry, but she ended up doing it herself! A series of beautiful "sisters" and a dreamlike "sister donburi"!!