rule 34 abs amber eyes anthro back biceps big muscles big penis black fur black nose brown hair canine claws darius koopa character duo fur furry furry only genital piercing green skin grey fur grey hair hair holding horn kissing lizard lying male male only mammal markings multiple males muscles nipple piercing nipples nude on back on top pecs penis penis piercing piercing plain background pose red eyes red penis reptile scales scalie sitting straddling stripes toe claws toned utx shapeshifter vein white background wolf yaoi yellow skin 1698789