I know Leslie had been working with her for many years prior but it was around this time he started making those Super photobooks, Super Ayu, Super Manny etc. I don't think it's a coincidence that the Party Queen photoshoot and PVs came about when both Timmy and Leslie were working closely with Ayu. But yes, it is ultimately her creative decisions.
I do also agree that Ayu always gave us a glimpse into her sexual part of her. But back then I felt it was depicted differently than now.