rule 34 absurd res ambiguous gender animal genitalia anthro avian beak bench birbdrain bird bodily fluids brown eyes canary cave chest tuft cloaca cloaca juice cloaca juice drip cloacal cloacal fingering cloacal penetration closed eyes coveralls dripping duo erection feather hands feathers finch fingering fingernails genital fluids genitals grey body grey skin hand on arm hand on hip hi res horn larger male leaking precum light looking pleasured male maleambiguous mammal mine muscular muscular male nails open coveralls open mouth oscine passerine penetration penis pickaxe precum precum drip rhinocerotoid sitting size difference tail feathers tuft yellow body yellow feathers zipper 7005533