Styvbror förförde sin dumma styvsyster

She's a naive 18-year-old girl who has never been to a real college let alone an event put on by her peers. She doesn't have any idea what's in or out among her social group so when her stepbrother tells her all the girls are taking it up the butt she spreads her legs and lets him stick it right up her ass before whipping it out and cumming on her tongue.