1boy, abs, aqua_background, bara, black_hair, black_male_underwear, black_pants, briefs, bulge, closed_mouth, clothes_pull, large_pectorals, male_focus, male_underwear, male_underwear_peek, muscular, muscular_male, naoki_(xhju8282), navel, nipples, original, pants, pants_pull, pectorals, short_hair, simple_background, solo, topless_male, underwear