Rule 34 Dev - 2016 2boys 3d abs achilles anal_penetration anal_sex anatomically_correct anatomically_correct_penis animal_genitalia animal_penis balls biceps big_balls brown_fur brown_hair centaur chest_hair chiron comic deep_penetration digital_art edit equine_penis erect_nipples erect_penis erection forest fur gay horsecock male_only mammal multiple_boys muscles muscular nipples nude outdoors penetration penis penis_size_difference pleasure_face priapus_of_milet romantic_couple sex sitting_on_penis size_difference stallion taur teacher_and_student testicles the_education_of_achilles toned vein veiny_penis yaoi|2361304200