anthro balls big_balls big_breasts big_penis blue_body blue_eyes blue_fur blue_hair breasts butt curvaceous curvy_figure female ftm_transformation fur gender_transformation genital_growth genitals growth hair hooves huge_ass huge_breasts looking_at_viewer magic magic_user male nipples nude orange_body orange_fur penis penis_growth simple_background solo solo_focus species_transformation thick_thighs transformation voluptuous wide_hips blubtf canid canine equid equine fox horse mammal absurd_res hi_res sequence
Kate had found the notebook of a former student, the notebook contained a masturbation spell within it that was described by the mage who once had it "impossibly potent!" but unknown to Kate the student who had used this forbidden spell forgot to to read the full thing, and how it had been designed for strapping male equines...

The spell, like the student long ago, did it's work on Kate,and within mere minutes all her strapping vixen allure was replaced with a femboy mare visage...