My parents remarried and I got a step-sister. She's cute, obedient, and has lots of friends. The friends she brings over are so horny I can't believe they're the same age... One day, while I was thinking about such naughty things, my step-sisters got caught in the rain on their way home from school and came to take shelter from the rain, soaking wet and see-through! I got so excited that I got an erection! They must be grown-up because they noticed my erection and started teasing me. I couldn't hold it in anymore! I let out the desires I'd been hiding deep in Kokoro!