Despite her inner hatred at being raped by her stepfather, she couldn't resist after being kissed, and her wet lips became incredibly sensitive. (Aoi Tsukasa, SONE-250)

I live with my father-in-law after my wife's death. Surrounded by him, our sex life gradually came to light, which became the catalyst for my father-in-law's despondency... It's all because of my erogenous zones. My lips are more delicate and sensitive than anyone else's. If I didn't have this... no, actually, I might already be satisfied.