Your step sister finds 2 pairs of your moms panties full of cum in your laundry and confronts you. She thinks you have some kind of problem with jerking off because the panties were full and wet. You tell her that you only came in them once, but she doesn't believe you came that much so she offers to help with a hand job while you sniff her panties so she can see for herself. After stroking for awhile you can't help but bust all over her pretty face just as your Mom walks in and catches you.