NYH-184 - I couldn't hold it anymore! Teaching my little sister a lesson after she kept flashing her panties at me

My little sister is small-chested but has plenty of experience. She gets caught masturbating, but instead of being embarrassed, she invites me into her room and teases me by flashing her naked body in the bathroom. With our parents out, she starts flashing her panties at me, and I finally lose it. Tonight, I'm going to unleash all my pent-up desires on her.