Never say never, but I doubt Azu will go back any time soon if things work out as she expects at KG. (She's a smart cookie and her expectations are pretty reasonable, so my bet is that she's found a new home at least for now.)
I've had both of those combos listed. They were really great sessions, because of the total volume of hot babe-ness and sexual atmosphere - like really, we're talking about 3 seriously hot women who each in their own way exudes erotic white light / white heat - but the sum was NOT greater than the parts. In both cases I thought my time would have been better spent just focused on Azu alone. Azu is different, and with the right doubles partner things will definitely get amplified all out of proportion, but not with everyone and that's exactly because she is different. She feeds off the vibe of who she's with and is way more transparent about what she's feeling in the moment. She can switch modes and easily fill a role, so a doubles of her with Lucy or with Helen would totally rock your socks, but to me even that is not the ultimate version of Azu. She has another gear and I'm greedy to shift into it every time I see her. With the right doubles partner she would, and hopefully Hara or one of the others there is one of them.
(Yes, count me among those who had planned an Azu / Sara session. Those two would have resonated. I had intentions for 3 or 4 months but because of breaks and vacations the planets and schedules just never aligned.)