rule 34 2019 adastra amicus adastra animal genitalia animal penis balls bedroom eyes biceps black body black fur blue eyes bodily fluids canid canine canine penis canis countershading erection fur genital fluids grey body grey fur half closed eyes haps hi res knot licking licking lips looking down male male only mammal masturbation multicolored body multicolored fur musclegut muscular muscular male naughty face nipples nude pecs penis piercing precum seductive sheath simple background sitting smile smirk solo tongue tongue out two tone body two tone fur white background wolf 3464797