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anus ball_gag bdsm bondage bound captured equid equine feathered_wings feathers female feral friendship_is_magic gag gagged genitals hasbro mammal monochrome my_little_pony mythological_creature mythological_equine mythology pegasus rainbow_dash_(mlp)solo submissive submissive_female tail tail_anus tail_bondage tail_tied unknown_artist vulva wings