You walk into your room to find your 18 year old step-daughter masturbating on your bed with your wife's biggest glass dildo. She's mortified that you've caught her, and tries to explain "I get really horny step-daddy... I just wanted to have something inside me, I couldn't control myself!" She thinks she's in trouble but you're not angry at all - in fact you reassure her that it's perfectly normal and you're happy she's satisfying herself. "You mean I can keep using it?" Your step-daughter is relieved and you encourage her to continue in front of you. She eagerly agrees and shows you how much of her step-mommy's dildo she can fit inside her tight pink pussy. When you tell her the dildo is meant for anal, she gets curious. It doesn't take much before she's asking to stretch open her tight virgin asshole. She takes it like a natural, asking you how she measures up to her step-mother. After she cums she suggests you leave the toy uncleaned so your wife can unknowingly fuck herself with the dildo covered in your step-daughter's cum.