Totally Unexpected

I work second shift at a very large manufacturing and distribution company. I’ve only been there a few months but somehow ended up working on a crew called STAT, that gets called to fix screw ups and special assignments. Basically, my swipe card gets me into most areas in the building, and one of the old timers gave me a master key for access to areas that don’t use electronic entry devices.
About a week ago, I was paged to report to The Catacombs, what they call the storage and mechanical areas. When I got off the elevator, I was met by Regina, a kind of tough looking girl, not unexpected considering where we work. I see her around a lot, usually wearing some tight jeans and almost always in a band t shirt or hoodie. She asked me to follow her so she could show me the problem. She was a few steps ahead of me and she turned a corner. When I came around, she was stopped right there. I stopped just before running into her,and she grabbed my jacket and just planted a kiss right on my lips for about a second then continued walking. I didn’t know what to say or do. I just asked “ Why?” Regina said she had a bet with some of the girls on the floor, wondering if I was gay or just shy. I asked “ and?” , that’s when she swiped into the ladies room and pulled me in.
Now, I had never been in the ladies room, and it’s way different than the men’s areas. A large mirror with a counter in front, a few stalls, a shower and locker area and a couch. Regina started kissing me again, and this time I was ready and kissed her too. She grabbed my hand and pulled it to her boob and I could feel how hard her nipple was in the palm of my hand. She broke the kiss, and unzipped the hoodie and had nothing under it. I went right back to kissing her and started rubbing that nipple.
She was definitely the aggressor and we ended up on the couch. Before long she was rubbing my wood through my pants and told me to get naked. By the time I got my pants and underwear off, she was on her back wearing only the unzipped hoodie and her socks. I got on top, and as I kissed her tit, she licked or spit on her hand, lubed me up and started guiding me in. Rubbing the head up and down her lips and using her heels to pull me into her. She was so wet.
I remember some little sounds and stuff as I pushed into her. I realized she had green eyes as I started to get a rhythm going. She had smaller but firm tits, a nice flat belly, and I was busy watching my dick slide in and out, trying my best to keep it together. I was surprised when she started biting my shoulder, and told me to keep going. I tried to stay at the exact same pace and then I knew it was time. She said go for it, so I pushed her legs up and went to pound town.
When we finally finished, I got up, ran some warm water and brought her back some damp paper towels to wash up. I just sat on the couch, watching her get dressed, and got a view of just how nice her body was. I also realized she was not only wearing a ringmaster but had baby feet tattooed on her back. I fucked a married woman.
Regina told me to wait in the bathroom a few minutes before leaving, and she would sign my work orders that I took care of the issue.
I hope I get a call from her again.