My dad recently remarried, and his new wife's daughter Himari became my stepsister. I was thrilled to have such a cute sister, but it turns out she's a horny girl who loves cocks. She'd sneakily flash her panties and tempt me whenever Mom wasn't looking, which was a real headache. One day, Mom went on an overnight trip with a friend, leaving me and the guys alone at home. Seizing the opportunity, Himari came on to me...