It was on x hamster so I don’t know if it’s anywhere else but it would be great if someone does know it. (sorry of not well written just writing the key things I remember)
There’s a couple in college and they’re fucking the roommate but that doesn’t stop them it makes it hotter and they start taking more risks in public locker rooms and other. The Boyfriend has to move away for a job so they do long distance. The boyfriend moves next door or downstairs to two women. He works with at least one of them with black hair(I think), the other is blonde and has a crush on the black hair woman. One day the guy gets locked out and is offered to stay and wait for the locksmith. It got heated with the black haired girl and they kiss. The boyfriend says to the blonde she should confess her feelings and he confused to his girlfriend she was mad for a week or so then she forgives him and has kinky cyber sex pretending she’s the girl or something. She moves to the boyfriend meets the women next door (they’re together now) and the girlfriend is amazed her boyfriend held back against such a hot woman she even want to bang her. Then the last part of the story details the couples spliting into two rooms and fucking first the girlfriend goes with the blonde and the boyfriend with the black hair they fuck and then swap or come into the same from and have a foursome.