Have seen a couple. One was a pretty funny story - met her through an UTR provider I was seeing at the time. The provider really wanted to get a doubles session with the three of us, so she kept showing photos of her “friend” the porn star. I actually wasn’t a fan of the porn star - hadn’t even heard of her before - I think she was like low 1000s rank on PornHub.
Anyway the provider was persuasive, and I got the sense she was more into it than I initially expected - she talked herself down for the doubles-session to be the same rate I usually see her at. So I agreed. I already knew the provider was super sexual, but during the session they both turned it up to the extreme. The amount of interaction between them was unreal - it actually felt like I was there so junior could be used by them. I had a great time and never repeated the double but wish I had sense to film that encounter.
I suspect they were actually dating or at least FWB. I knew the provider was Bi; and it looks like the porn star “friend” actually shoots some amount of girl-girl scenes too. Can’t complain, basically got a free romp with a tier-3 pornstar and one of my fav UTR at the same time!