FURVERT!

abs animal_genitalia animal_penis anthro balls bdsm bondage bound cage_muzzle canid canine canine_genitalia canine_penis canis chain chain_leash chained_to_wall collar digital_media_(artwork)domestic_dog erection genitals german_shepherd gradient_penis hair herding_dog hi_res knot leash leather leather_collar looking_at_viewer male mammal milo_nettle milo_nettle_(character)muscular muscular_male nipples pastoral_dog pecs penis pink_hair shaded shepherd sinister_smile sitting smile soft_shading solo spread_legs spreading text url vein veiny_penis