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2013 4:5 abs angry anthro bdsm biceps biped bondage bound brown_body brown_fur brown_skin circumcised cuff_(restraint)equid equine flaccid full-length_portrait fur genitals hair holding_fixture hooves horse humanoid_genitalia humanoid_penis looking_at_viewer male mammal muscular muscular_anthro muscular_male nipples nude pecs penis pole portrait pose presenting restraints saddle shackles short_hair solo spearfrost standing submissive submissive_male vein white_body white_hair white_skin