rule 34 2023 anus avian backsack balls beak black claws blue sky brown body brown fur claws colored countershade fur countershading day dragon duo feathered wings feathers feral feral on feral fur furred dragon genitals grey body grey countershading grey fur gryphon hi res imminent anal larger feral larger male lying male malemale membrane anatomy membranous wings mythological avian mythology on back on top outside quadruped rakess size difference sky smaller feral smaller male snow straddling white balls white body white countershading white fur wings 9209111