Well, I think you want variety so perhaps a brunette with small(ish) natural breasts. Boo would be a great choice. So would Charmane Star. Actually, I haven't seen Boo lately and so I wonder if she has gotten a boob job. A redhead like Dani Woodward would also be good.
For the second woman, I'll go for a blonde with big(ish) fake ones. Savana Samson would be good. There is no shortage of blondes with fake tits.
Unfortunately, my normal version of a three way is switching off between my right and left hands. :crying: