anal anus ball_gag bdsm bit_gag black_and_white bondage bound bridal bridle chain chained digital_drawing_(art) duo equine feral feral_on_feral friendship_is_magic gag gay horse king_sombra_(mlp) line_art male mammal monochrome my_little_pony penis pony raised_tail saddle sex shackles side_view sketch submissive sweet_nip tail_lifted zip_zap  ambercoyote anal animal_genitalia ball_gag balls bdsm bent_over big_macintosh_(mlp) blush bondage bound collar cum cutie_mark doggystyle drooling duo equine eyes_closed feral fetlocks freckles friendship_is_magic from_behind gag gay hooves horse horsecock male mammal moan monochrome my_little_pony open_mouth original_character penis pony precum raised_leg saliva sex sketch standing sweet_nip tongue yoke zip_zap  animal_genitalia anus ass_up balls bdsm bent_over bit_gag bondage bound bridal bridle butt equine feral fetlocks gag hooves horse horsecock kneeling looking_back male mammal monochrome my_little_pony original_character penis perineum pony presenting presenting_anus presenting_hindquarters raised_tail sketch solo submissive sweet_nip tail_lifted zip_zap