rule 34 2021 anthro balls beckoning bodily fluids canid canine claws cum ejaculation erection fur genital fluids genitals gesture humanoid genitalia humanoid penis looking at viewer makowolf1 male mammal markings masturbation muscular muscular anthro muscular male nipples nude one eye closed pecs penile penile masturbation penis simple background smile solo standing tongue tongue out white background wink zipper 4936961