rule 34 2022 2boys anal anal knotting anal penetration anthro anthro penetrating anthro penetrating human anus ass balls biped canid canid humanoid canine canine penis canis claws consensual dark skinned male dark body dark skin digital media artwork digitigrade duo embrace enthusiastic enthusiastic consent flaccid while penetrated fur gay genitals grey body grey fur half erect heart hi res homosexual human human on anthro human penetrated humanoid genitalia humanoid penis interspecies intimate knotting male malemale male human male only male penetrated male penetrating male penetrating male mammal penetration penis romantic romantic couple sex sileynus simple background toe claws werewolf white background white fur wolf wolf humanoid yaoi 6693005