Huh, I guess that's where the phrase: 'Doesn't matter, had sex' comes from.Don't ever shit where you eat. Nothing good can come out of it if you value your job.
That said, I had a similar experience. I was a daily supervisor at a small firm and had a colleague who apparently were attracted to me. She'd make all sorts of subtle signals like making sure she was alone with me in a room and wear outfits that were revealing. She's make sure that whenever another woman was asking me something, that women had to do some very important work at another place in the building.
Lastly, the company once held a personal party near the beach in the summer. She got me to follow her to another part of the beach and wanted me to help her put on sunscreen. I did that and she then took off her bra. I kindly helped her out and then put her bra back on, like the idiot I was.
Finally I noticed all these signals and ended up doing her in her office. Things got bad between us and it turned out she also had a boyfriend. I had to quit my job, but I quickly found another.
Take from me. Don't get involved. Nothing good, except sex, can come from it.
Was she hot btw? Just asking. :P