rule 34 2023 abs anthro balls big balls big penis black and white ear piercing ear ring flaccid foreskin genitals hi res humanoid genitalia humanoid penis looking at viewer male mammal monochrome murid murine muscular muscular male neck tuft nipples pecs penis piercing plantigrade pubes rat ring piercing rodent solo solo male tuft utx shapeshifter vein veiny muscles veiny penis 7569213