I've had a couple of excellent threesomes with Lanya and Good Girl 69, but they took place in Paisley which may be out of your area. Although I punt mainly in Edinburgh, I will go further afield for a different experience.
I left a Review on here about my 3sum with the aforementioned.
I've tried to see Nicky on a couple of occassions, but times have never quite meshed properly, still on my to do list though. A threesome with her and Lanya could be great fun I think if Lanya was on form. I've seen her many times over the years, she used to be an excellent punt when she had her "crew", but since she returned from a long break I have seen her a couple of times and the quality hasn't been nearly as good. The last time was a real let down though, lacklustre performance, in a bit of a dump, out the door in less than an hour and she didn't smell the best. I've not considered returning since, but never say never.
Try contacting juicy-jane-, she does duos with Heather Pleasure, just a suggestion.
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I've seen both individually, that would be the most vanilla threesome of alll time!
Heather I've seen many times, she was always reliable but generally a pretty vanilla punt and a great plan B, although I will say that she really uped her game the last time I saw her after she took a lengthy break (reviewed). Jane, on reflection should have been a neutral when I saw/reviewed her, she just wasn't really very good and the much touted arse was average at best IMO.