
Ambrosia Slaad |

Is this for PFS or your home games?
Kitsunes can upgrade their innate change shape (a single unique human form) with the Realistic Likeness feat. I don't play PFS, so I don't know if this is PFS legal.
If homebrew is OK, you and your GM might look at this old stab at a sorcerer succubus bloodline. You might want to tinker with it a bit.
If 3PP psionics is OK, you might consider the 3rd level change shape talent available to rogue's with the menteur archetype (in Dreamscarred's Ultimate Psionics). You'd be limited to 0-level and 1st-level telepathic/enchantment powers/spells though. You might instead modify the change shape talent to instead use it with an (enchantment spells focused) eldritch scoundrel rogue (in Paizo's Arcane Anthology).
Edit: I also wrote a vishkanya-themed article for the River Kingdom Wayfinder issue that didn't get accepted. If you are interested in a vishkanya PC, the article had a face molt alternate racial trait (PM me for the link).