rule 34 2019 4 toes anthro anus arms tied backsack ball gag balls black eyebrows black nose bondage bound canid canine digital media artwork erection eyebrows fennec fox furry furry only gag gagged green eyes hands tied humanoid penis legs tied looking at viewer male mammal open mouth gag penis rope rope bondage solo spinal22 submissive submissive male toes 3459268