rule 34 2019 abstract background anthro ball gag bondage bondage bound buckle chains cuff restraint dated derek zwoosh k9 digital media artwork dragon duo felid fur gag gagged grey body grey fur holding object horn male malemale malorne mammal nipple clamp pantherine purple body purple scales randy zwoosh k9 restraints scales scalie signature spreader bar standing straps whiskers wrist cuffs 6977234