My one and only FS duo was with Betty Black + Riley Pierce, and I had a great time. I had seen both of them before (solo) and I thought they would have good chemistry together. I was not wrong, and was very happy I introduced them to one another.
You said you had a couple experiences with one girl (the same girl?) so far, you could ask her if she has a duo partner that she likes working with. The girls’ shared chemistry will go a long way in making the session fun for you.
Of course, I would also recommend Betty + any of the long list of women she has listed on her Tryst ad, including Charlee who posted above.
Also, here’s an unpopular opinion: duos aren’t for everyone. I did it and had a really fun time, but I also realized I tend to prefer the intimacy, slow sensuality and connection of a 1x1 session vs the intensity of a duo. That doesn’t mean I won’t do it again, and I really did have a fun time with Riley & Betty; but I’m not chasing that experience like I was before, after doing it once.
Good luck