2019 ambiguous_penetration anthro armwear ass big_macintosh_(mlp) blonde_hair clenched_teeth closed_eyes clothing cutie_mark duo earth_pony equid equine female female_penetrated friendship_is_magic from_behind_position hair horn horse male male_penetrating mammal my_little_pony open_mouth penetration pony purple_hair sex signature straight sugar_belle_(mlp) teeth unicorn url zwitterkitsune