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2010 anthro balls bdsm better_version_at_source biped blush bondage bound brown_hair butt equid equine erection foreskin genitals green_eyes hair horse humanoid_genitalia humanoid_penis male mammal mane milo_nettle navel nipples nude penis restrained shadow side_view signature simple_background snout solo spots standing submissive submissive_male tail tail_wraps white_background wraps