I have done a double with Shelly and Nana a few times and they are great together, and yes they are good friends, they both worked at 533 before Angie took the place over they are the only girls left from those days except of course for Michelle.
Nana doesnt like her tits sucked or played with so you can go to work on Shelly in that department if your like me and love it and then have all the fun with Nana as well making me feel like another double with the two of them.
They both work Tuesdays so I assume that its when you got to do your double.