START-301 I felt like I had been violated when I saw my sister, who I haven't talked to in years and doesn't wear makeup, being forced by a sleazy guy. My trauma boner won't stop. Miyajima Mei

My older sister has become estranged since I was accepted into a famous school.One night, when he invites Sugai, who is from the same school, to his home, he runs into his sister wearing no makeup.That day, Sugai was sacrificed, but the sister, who had felt pleasure, blossomed into a woman.I pretended not to see my sister being thuged and becoming Sugai's sex friend.Today, I was able to hear my sister's voice through the wall and get an erection.