Can my fellow hobbyists recommend a double / couple who interact together well (true girlfriends into each other would be best) and then allow client participation?

Cummings Lane, without a doubt.  Jasmine is an exceptional hostess, willing to provide any level of entertainment from GFE to PSE and beyond.
I have seen her (multiple times) and two of her girls, Ashley and Stephanie, each separately and Jasmine and Ashley together. All have been unforgettable experiences.  Check my reviews of them.