Pull her dress off

You slowly take off her dress, revealing her naked body an inch at a time until you get a full view. With her legs spread you can easily see her big ass and her pussy lips. Her big perfect tits are amazing, adding to her already super attractive body. Your cock is so hard now as you look at her and you pull your shorts down, getting it ready for her.

You're so glad your parents chose this beautiful woman to watch you and your sister.