alpha_channel anus ass_up blush butt cutie_mark equine female friendship_is_magic fur hair horn horse looking_at_viewer looking_back mammal my_little_pony panties plain_background pony presenting presenting_hindquarters purple_eyes purple_fur purple_hair pussy pussy_juice raised_tail solo transparent_background twilight_sparkle_(mlp) underwear unicorn wasajoke winged_unicorn wings