ROYD-364 A pure and extremely shy younger stepsister was teased day after day and became highly sensitive, climaxing over and over. She transformed into a perverted girl who keeps climaxing with a lewd expression. Aizawa Miyu

My parents remarried, and I ended up with an adorable new stepsister. She’s a very shy, timid girl. Taking advantage of the fact that she couldn’t clearly say no, I kept teasing her nonstop. At first, I would lightly poke at her through her clothes, and then day after day I kept bothering her in the same way. Before long, she became so sensitive that she would react intensely, and eventually she grew into a more confident schoolgirl who could clearly say, I want my big brother to pay attention to me.