For me, duos are all about the sensory overload. I'm a pleaser, so I get incredibly turned on by pleasing and seeing others pleased, and in the duo context there are just so many possible combinations of touching and stroking and massaging available. Choosing compatible ladies (i.e. ladies that truly like to have sex with other ladies) makes this even more so.
That said, my best memories are when taking turns doing two-on-one, so that each of the three participants gets equal attention and pleasuring in turn. Since the ladies are usually multi-orgasmic, they tend to get a little bit more attention but that totally works for me. Also, memories of having my balls licked while deep inside the other lady, - and of being ridden while having my face sat on - do tend to give me recurring knowing smiles when seeing two civilian lady friends together while out in public.
What makes the experience worth it? Firstly, the threesome dynamics as I mentioned above. Secondly, most ladies will offer a break on their hourly rates when doing duos, so it's also cost effective.
Duo suggestions for Nanaimo: Hands down my top choice (as anyone who has read my reviews will know) is Priya Maha Rani and Miss Lady Vanessa. Those two together make dreams come true.
That said, any of these Nanaimo ladies together works very, very well (either MFF, MFFF, or even, dare I say, MFFFF):
Priya Maha Rani (Pretty Priya)
Miss Lady Vanessa
Lalani Electrica
Veronica Blake (sometimes works in Nanaimo)
Miss Starla Rayne
Sweet and Sexy Grace
Feel free to PM if you have any questions.