rule 34 2023 anus ass balls black anus brown body brown fur digital media artwork erection felkin feral fur genitals green eyes hi res looking at viewer male mottled mottled genitalia mottled penis multicolored body multicolored fur musk musky balls musky butt penis perineum presenting presenting hindquarters quadruped rear view simple background solo teavern two tone body two tone fur white background white body white fur 8813954