After Teasing My Demure And Super-shy Sister-in-law Day After Day, She Developed A Super-sensitive, Quick-to-orgasm Body And Started Cumming Nonstop! She Completely Transformed Into A Perverted Girl Who Cums Like Crazy With A Lewd Expression On Her Face. Nanao Ayatsuki

Due to my parents' remarriage, I suddenly got a stepsister. She had an incredible transparency and was super cute, and honestly, I wanted to do something about it. My sister was quite shy, weak to pressure, and a timid coward who couldn't voice her own opinions. So, even if I touched my sister's nipples every day from morning till night, not only did she not complain, but she started to feel it, even drooling and twitching in response... Her nipple sensitivity kept increasing, and eventually, she'd come to me on her own to ask me to touch them. Even though she has a boyfriend? She's an incredible pervert.