Okay, here’s my attempt at a blog post in the style you requested, focusing on the experience and using simple language and basic HTML tags:

Alright, so, “threesome at work.” Yeah, you read that right. It happened. Let me tell you the whole messy story.
It all started like a normal Tuesday. I woke up, dragged myself out of bed, same old routine. Got to the office, grabbed a coffee – which, by the way, was way too weak, but whatever.
We had this new project, a real pain in the ass. Lots of pressure, deadlines looming. So, me and two of my coworkers, Sarah and Mark, we were huddled in a conference room, trying to figure this shit out.
We worked late, like really late. Pizza boxes piled up, energy drinks everywhere. The stress was high, you know? We were arguing, then laughing, then arguing again. It was a rollercoaster.
The Turning Point
At some point, I don’t even know when, things just…shifted. Maybe it was the exhaustion, maybe the shared frustration, maybe the two six-packs of beer Mark snuck in. We started talking, like, really talking. Not about work, but about our lives, our frustrations, our…desires.

One thing led to another. Flirting, touching. It was like a movie, except way more awkward and less sexy. It was very hot.
The Aftermath
The sun came up, we looked like hell, and the project? Still a mess. We never finished on that project, and that made me so anxious.
We never spoke of it again. Work was awkward for a while, but then it just… wasn’t. We’re still colleagues, but it’s like that night was some weird fever dream. I can’t even imagine what’s going on between Sarah and Mark.
Would I do it again? Probably not. But hey, it’s a story, right? A crazy, messed-up, “only happens in the movies… or maybe at my office” kind of story.