rule 34 against wall anal anal sex anthro ass backsash balls black nose blush canine claws cum cum in ass cum inside duo erection fur furry furry only gay green eyes green hair gripping hair hindpaw holding internal knot long hair lying male mammal multi colored hair mustelid no humans nude on back open mouth otter pawpads paws penetration penis plain background red eyes sex smile spread legs spreading standing teeth toe claws toes tongue tongue out white fur 1503367