Rule 34 Dev - 1boy animal_genitalia animal_penis anus ass balls ballsack big_balls close-up colored crystal cutie_mark dangling_testicles equine equine_penis erection fan_character feral flower_in_mouth grey_background headshot_portrait horse horsecock looking_back low_hanging_balls male male_only mammal mane medial_ring model_sheet multiple_images multiple_poses my_little_pony penis perineum petrock plain_background pony portrait presenting presenting_hindquarters quartz_poker scrotum semi-erect sheath sitting solo testicles|1867082472