rule 34 alien ambiguous gender animal genitalia arachnid arthropod wars bondage bound cheetah cheetor claws cum cybertronian diphallism duo erection feline fur hi res humanoid living machine machine male mammal maximal multi limb multi penis open mouth oral penis predacon prowlantulas robot simple background spider spiderweb spots spotted fur tarantulas tarantulas transmetal teeth tongue transformers transmetal transmetal tarantulas transmetals xenospike yaoi yellow eyes 2719429