You sleep at Diana's

You decide that you wanted to ask Diana if you could sleep at hers. Already thinking of her beautiful face and her nice curves got you hard. "Of course, you can sleep in the guestroom" she writes you after a couple of minutes. You thank her, knowing that you will NOT sleep in the guestroom tonight. After packing your things you take the bus to her house. She opens you the door and lets you inside. Diana looks at you "You can put your things in the guestroom. I think you know the way" and laughs. You go up the stairs to the first floor, where only four rooms were. The first one was a big bath, then there was the guest room and Diana's and her sister Chelsea's rooms. As you get up the stairs you see Chelsea who greets you before going into the bathroom.

Now you had the perfect opportunity to swap. You could either go into Diana's room and swap places with one of the hottest girls in class or you could go into Chelsea's room and become Diana's slutty, hot sister, who also was the hottest girl in her year by the way. Or you could just put your things in the guestroom and go to the party as yourself.