Rule 34 Dev - 1boy 1male anthro balls balls_to_knees beard big_balls big_penis bng diphallia diphallism equid equine erection facial_hair flaccid flared_penis greyscale horse huge_balls huge_cock male male_only mammal medial_ring monochrome multi_penis muscular muscular_male nude nude_male pecs peeing penis sidesack sketch solo standing urine vein veiny_penis|3528694032