HUNTC-270 I don’t want this… Why do I look so flustered? (inner voice) After being teased every day by her extremely kind and timid older step-sister, she transforms into a sensitive girl who starts reacting with a shameless expression

My very gentle, timid stepsister is always considerate and kind to me. So I thought it would be okay to do something a little naughty, and when I tried lightly teasing her, it seemed safe! I thought maybe I could go even further, so I kept gradually escalating my teasing every day. At first, she looked a little uncomfortable, but little by little her expression changed into one of pleasure. By then I figured it must be fine, so I kept teasing her in all sorts of ways and built a relationship where we could become intimate. Honestly, I started out just messing around, so I was surprised that it ended up becoming something much more. Now, just a light touch is enough to make her extremely sensitive.