Morrigan Aensland (I like her to dom, but it's really sexy to see her sub as well)
Medri's Kassidy
Saber Arturia
Caster Tamamo
Shielder Mashu
Princess Peach/Rosalina/Zelda
Any of the Sailor Scouts, but especially Mercury
Zko's Crystal
Naoto Shirogane from Persona 4 (especially if she's getting hypnotized to be more girly/feminine, either bimbo-lite or Stepfordized)
Lulu from FFX
Mitsuru Kirijo from Persona 3
Yang from RWBY
Sheena from Tales of Symphonia
Judith, Estelle, and Rita from Tales of Vesperia

Those are the ones I can think of off the top of my head at the moment. There are definitely more, but I'll have to come back and edit them in.