Looking for cheating story

[jeremygilbert]

I am looking for an already published story where the boyfriend was helping his girlfriend's hot friend move into a place and one thing led to another and he ended up cheating on his girlfriend with her. They enjoyed it, I remember reading something about him first helping her with some computer wires, which helped her seduce him. I believe he spoke to his girlfriend on the phone while having sex with her friend. It is possible that he and his girlfriend were engaged, but I am not certain about it. I think the friend was moving to a college dorm, not certain about that as well. Thank you in advance for your help.