[MF] Me and my co worker had sex at work

I [M] worked at a drive through car wash and there was this girl , who was very much my type , she was my age (20) at the time , has nice dark brown hair , light skin tone, Mexican , with nice brown eyes and a sexy smile and voice , not to mention she was slim with big boobs I’m talking atleast a D cup . The thing was she did have a boyfriend but I don’t think she cared much for him.
It started off with her always making small talk with me and well I was the supervisor so she would always come talk to me , first it was all work related but then it started to get more personal . She would take her lunch with me and etc.