rule 34 abstract background anal anal tugging anthro anus arched back ass balls bent over big balls big dom small sub big penis blue body blue scales bodily fluids claws dinosaur dominant dromaeosaurid dromaeosaurus duo feral genitals grass green body green scales large insertion lying male malemale markings open mouth penetration penile spines penis pink markings plant reptile rough disambiguation rough sex sadosaurus saliva scales scalie sex shocked shocked expression size difference size play stomach bulge stretch marks tail curl teeth theropod tongue tongue out tyrannosaurid tyrannosaurus tyrannosaurus rex vein veiny penis zoophilia 5559335