I went to the changing room and found my sister's friend who was staying over taking a shower! The bathroom door at our place is super see-through! Lucky me! I peeked in, and her tits and pubic hair were fully visible! Plus, I even caught her masturbating! Thinking this chance might never come again, I was engrossed in watching when she got caught. "Don't tell my sister about the masturbation!" She grabbed my dick.
