I'm forced to watch my girlfriend's best friend fuck on the next bed, driving me wild with desire

My girlfriend brought her best friend to live at our house, and now we have to share a bed with her. I\'m not happy about it, but my girlfriend doesn\'t seem to care. She\'s always busy with her friend and I feel like I\'m fucking her to get my girlfriend back. It\'s not right, but I can\'t help myself.