【I want to play with Karin-chan's hard nipples!】When I was a child, my parents remarried and I got a stepsister. We became close and became like real siblings... But gradually, he became excited by her growing breasts and started observing them. And when he peeked at her erect nipples, his desire to touch them exploded! Unable to resist, he started playing with them, and she struggled saying "Big brother, stop!" But every time he stimulated her sensitive nipples, he saw her twitching and his sexual desire ran wild! Unable to stop, it escalated into nipple-kneading sex! The sister, who came multiple times due to the pleasure, accepted her brother's perverted sexual development training. "I'll make Karin-chan grow into a premature ejaculation constitution!"
