ROYD-335 — My innocent and extremely shy stepsister became super sensitive and prone to premature ejaculation after I harassed her every day, and now she's orgasming like crazy! She transforms into a perverted girl who orgasms like crazy with a vulgar look on her face. - Otonashi Suzu

My parents remarried, and I suddenly gained a stepsister. She's a shy girl who can't express her opinions, a timid girl who can't clearly say no to things she dislikes. But after I started harassing her with nipples every day, her sensitivity increased dramatically, and she became unable to live without it. In the end, she came to me, her older brother, on her own, and this is a record of how this once withdrawn girl, who couldn't even express her opinions, began to ask me to touch her nipples with her own mouth.