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1:1 2023 4_fingers adeer animal_genitalia animal_penis anthro bdsm biped blue_eyes bondage bound bulge detailed_bulge digital_media_(artwork)encasement equid equine equine_genitalia equine_penis fingers genital_outline genitals glistening glistening_body grey_background hi_res hooves immobilization latex looking_down lying male mammal nude on_back pecs penis penis_outline signature simple_background tail unguligrade vacuum_bed white_body zebra