Very Shrunken Stepbrother in My Ass

I'm in my room, in a skirt that barely covers my big, round, firm butt, when I feel eyes on me. I turn and there is my stepbrother, shrunken, staring at me with my giant ass. I smile mischievously and drag him inside "You love my ass, don't you? I push it and rub it hard against my giant ass. Slowly, I rub it inch by inch over my buttocks. Damn, how delicious it feels to feel your body shrunken in my ass