Her boyfriend Gabe picks you up

You look on her phone and see that her boyfriend Gabe was going to pick her up here. After a couple of minutes you see his car. You get into it and he greets you "Hey Babe" and gives you a great kiss on your lips. Not wanting to attract attention you kiss him back. It kinda felt good, you don't know exactly why but it did. "Hey Gabe" you say as he begins driving again. "How was your day ?" He asks and you tell him about your day. You two begin to have a conversation like couples normaly have.

Like the way he acts you know he wants to have sex with his girlfriend (you) and you already saw she wasn't virgin. Since he is the only boyfriend she ever had they must have had some sex already.

As you two arrive at your new house you two go in and notice that you two are alone and you two head to your room.

Will you get layed as Cloe ? Or will you fuck your sisters best friend by switching to Gabe ? Or do you completely chicken out ?