Sexy af

I fuck my coworker and her boyfriend too. My boyfriend is the one that encouraged it and supported me while I navigated it and tested the waters slowly. I'm not truly bi but it's more of the situation I'm into and why I keep doing it. I don't think I would just have sex with just her without another guy involved, even tho I have let her lick my pussy at work without her boyfriend which is outside of their rules they set for the arrangement to be comfortable for them.
We were alone at work which is rare and she pulled me in that back and just went for it. I felt bad for helping her cheat on her boyfriend.

Is it a man or a woman? Just threesomes or other scenarios? Please share a few more details.