Ai-chan x Imouto-chan x BBC (request) (Patreon)

Ai-chan and her stepdad are having sex there since nobody is home, but Imouto-chan comes home early that day and catches them in the act. She is shocked and should be horrified over this but her stepdad's huge black cock completely captivates her. Ai-chan suggests she join in the fun, and though she's very nervous and shy, it doesn't take long before she becomes her stepdad's slut the same as her sister.