Description
This happen during a weekend we spend at a friend's place. It was me, my girlfriend, my sister and a friend. When we are between relations my sister and I like to have sex. That morning my girlfriend went out with our friend to go to the supermarket and buy something for us to eat. Before I know it I have my sister on top of me like crazy and saying: "Don't worry. We're alone. I need this. Fuck me, bro. I miss your cock.". I let it happen and I was only wishing my girlfriend didn't open that bedroom door.
