Rule 34 Dev - 1boy 2023 abs anthro armpit_hair balls barazoku bedroom biceps big_balls big_bulge big_muscles blurred_background body_hair bulge closed_eyes clothed clothing equid equine erection erection_under_clothes erection_under_clothing eyebrows genitals hair horse huge_bulge huge_muscles inside low-angle_view male male_only mammal muscular muscular_anthro muscular_male navel nipples nomifuki obliques open_mouth pecs pubes simple_background solo standing stretching teeth tenting thick_thighs topless topless_anthro topless_male underwear vein waking_up window yawn|8059953920