Not me, but I once vowed to bring it up as much as possible, so here's the story of a long forgotten /tv/-anon.

Maybe it was a LARP, but I want to believe in a magical world and I think it's plausible because it was a long time ago and she was a known-but-not-particularly-popular-actress, also these kind of hook-ups is not that unlikely within the social circle of similar business.

Anyway, the guy allegedly had a ONS with Hayley Atwell. He was working in British television, and during some dinner event or whatever they hit it off and he ended up going home with her. The guy greentexted about it (that's now lost to time, that's a pity, I would love for some 4chan historian to have saved it), nothing particularly rude or crass: she's apparently very flirty-touchy (some other anon happening to be active in the theatre scene seemed to conferm that's very true both for her and Gemma Arterton) but kind of shy during the actual sex. I don't remember the whole thing, but I remember he said that they did doggy, and after the fact he kind of kicked himself for not playing with her boobs more, but if you bag Hayley Atwell you're not going to fuck it up by being pushy about it.

And that's all I recall about it.
I raise a glass to you, forgotten /tv/ anon, I will never let your legend fade into nothing.