You and your GF are on vacation, hanging out in a lovely poolside cabana. Your GF comes back from swiming laps and seeing her ass in her swim suit and hard nipples turns you on so much. You get really hard for her and ask her to have sex in the cabana. She is really hesitant because the door to the cabana does not lock and there are lots of people near the pool. She teases you and you convince her to give it a try by letting your fingers wander to her pussy. She tells you that she does want to have sex but she won't fully take her suit off, just in case someone walks in on you two. She pulls her suit to the side and fucks you cowgirl! She flows between being fully immersed in you and checking the door. Just before you're both about to cum there is a knock at the door! She pulls off of your cock and quickly pulls her suit up to answer the door. An employee tells her that they need to speak with her at the front desk. She changes out of her swimsuit, covers up with a towel, and tells you she will be back soon. While your GF is down at the front desk, you hear a knock on the cabana door. An incredibly sexy woman walks in the room and sits down. She is in a really skimpy micro bikini, with a full face of makeup, and jewelry (the exact opposite of your GF). You're really turned on by her and she notices! She tells you that she heard moaning coming from your cabana and she wants in! You're on vacation after all, why not have some fun! She takes your cock from the back and then switches to riding you! Right as you're about to cum the door opens and your GF walks in! They're both shocked and you realize they know each other. But they don't just know each other, they're step-sisters! As details of the past few minutes come out, the step-sisters are pissed...at each other and you! As they're fighting, the situation gets even worse...their family barges into the cabana and catches the three of you in a super awkward situation!