Tards: I present to you my situation.

So my coworker (female age 45, 4 kids, still fuckable in appearance, stuck up, horrible liar, has boyfriend, one kid 2 years old by mishap) is sucking and fucking a male coworker who is just a pick up guy comes by a few times a day. I know via audio recording.
I wanna fuck her too, but need the job, how do I go about letting her know that I am in the know, and want some as well?