anal anal_insertion anal_penetration anus blue_fur blue_hair blush bound cutie_mark dildo dimwitdog equine female feral friendship_is_magic fur gag gagged hair horn horse insertion lying mammal masturbation my_little_pony on_side penetration pony princess_luna_(mlp) pussy pussy_juice ring_gag sex_toy solo spread_pussy spreading tongue tongue_out vibrating_egg vibrator winged_unicorn wings