At my office Christmas party a coworker 10 years my junior approached me and out of nowhere said she really wanted to fuck me. I laughed and joked back saying I would fuck her if we were both single.

We carried on with the party and danced a bit though nothing out of order and with our team.

At the end of the night she tried to work it so we got in a taxi together. I managed to make my excuses and get my own cab as I was going home and everyone else was heading out afterwards.

When I got in my girlfriend was still up and we had some pretty awesome sex. I pretended I was more drunk than I was so was talking really dirty and forcing her head down on my dick and asking her to lick my ass and balls. The whole time I was imagining my coworker and fantasising I was with her.

I'm not particularly attracted to my coworker, but over the weekend I've found myself fantasising more about being with her and convincing myself she's filthy in bed and an incredible fuck.

It actually makes me excited to go to work for once on a Monday morning!