2016 3d_(artwork) abs achilles animal_genitalia animal_penis balls biceps big_balls big_penis blonde_hair brown_fur brown_hair centaur chiron cum cumshot digital_media_(artwork) duo ejaculation equine equine_penis equine_taur erection fellatio forest fur hair harp hooves horse human humanoid hybrid interspecies larger_male male male/male mammal muscular musical_instrument nipples nude oral orgasm pecs penis priapus_of_milet romantic_couple sex size_difference taur the_education_of_achilles tree