Rule 34 Dev - 2013 anus ass back_turned cutie_mark equine female feral friendship_is_magic hair half-closed_eyes horn horse legs_up looking_back lying multicolored_hair my_little_pony on_back plain_background pony presenting presenting_hindquarters princess princess_celestia_(mlp) purple_eyes pussy royalty signature solo terrabutt unicorn white_background white_fur|1495765656