He Invites Me to Watch the Game but I End up Fucking His GF

A friend invited me to his house to watch a soccer game.We were quietly watching the game until his girlfriend arrived, a very beautiful and flirtatious girl, to my surprise she started seducing me and touching me while her boyfriend didn’t see her. I take advantage of the fact that my friends are focused on watching the game and I ask to borrow the bathroom to go fuck my friend’s girlfriend in her own bed.She’s a real whore.