Rule 34 Dev - 2017 anthro canine chain_leash chains collar cum cum_on_face echidna foursome fox furry group group_sex hedgehog humanoid_penis knuckles_the_echidna leash male male_only mammal monotreme penis sex shadow_the_hedgehog sonic_(series) sonic_the_hedgehog syaokitty tails team_sonic yaoi|2551302744