Rule 34 Dev - 1boy abs animal_genitalia animal_penis anthro big_penis biped chewycuticle clothing doorway equid equine equine_penis erection flared_penis genitals green_eyes hair horse inside jockstrap male male_only mammal medial_ring mottled mottled_genitalia mottled_penis muscular muscular_anthro muscular_male nipples penis simple_background solo standing underwear|5024437448