It is Katherine.

Kat walks in and smiles at you. "I hope you saved some for me!" she exclaims. Is she thinking what you are thinking? Kat walks over and kisses Sarah and before you know it Sarah has already undressed Kat and they ask you to join in on the fun. You kiss Kat's neck working your way down to her amazing breasts. You start to nibble on her swollen nipples and feel yourself rising to the occasion again.

You slide your hand down to Kat's knee and rub it up her thigh. "Nice!" you exclaim as you get your first peek at Kat's hot spot. She is shaved and very wet. You slip a finger in and try for two only to realise that she is a lot tighter than expected. Sarah is sitting back on a chair rubbing herself. She tells you to brake Kat in. You put her in the chair you were sitting in and you rub the head of your dick along Kat's opening to get it wet.

"Hold on, this will hurt a little but I will be gentle."
Kat smiles and says "put it in me stud." You push the tip in and with one thrust, you are in something tighter that you have ever imagined. "Ohhhhhhh" Kat moans as you start to thrust a little faster watching her beautiful tits bounce in the air. After a few minutes of moaning and screaming you feel Kat's muscles tighten against your dick. "I'm gonna cum" she moans and you feel her juices running all down your cock and legs.

As a result of this sensation you explode inside of her filling her tight hole with your bodily fluids. You pull out and Katherine gets on her knees and takes you in her mouth sucking you completely dry. "Would you like to spend the night with me and my sister?" Kat asks. At this Sarah stands up and says she is having a party at her house and everyone will be coming over. What are you going to do? You have to make a decision quickly.