anal anal_insertion anal_masturbation anal_penetration ass_up blush bow butt buttplug cutie_mark dripping equine eyes_closed female feral flitter_(mlp) friendship_is_magic fur green_hair hair horse insertion mammal masturbation my_little_pony open_mouth orgasm pegasus penetration plain_background pony purple_fur pussy_juice sex_toy signature solo spread_wings terrabutt white_background wing_boner wings