Rule 34 Dev - anatomically_correct anatomically_correct_anus anatomically_correct_genitalia anatomically_correct_penis animal_genitalia animal_penis anthro anus backsack balls bars bdsm big_anus black_border bondage border bound butt equine_anus equine_genitalia equine_penis genitals half-erect hooves looking_at_viewer looking_back male nude open_mouth penis prison puffy_anus raised_tail rear_view solo spread_eagle spread_legs spreading submissive submissive_male tail unguligrade window furronika rabin equid equine horse mammal|5000531655