My parents remarried, and suddenly I had a stepsister. She's incredibly cute with a pure, innocent look, and honestly, I wanted to do something about her. My stepsister is quite shy, easily swayed, and a timid coward who can't express her own opinions. So, even though I touched her nipples every day from morning till night, she didn't complain; instead, she started to feel pleasure, even drooling and trembling in response...