Rule 34 Dev - aged_up anthro balls black_background black_sclera erection fur genitals horn humanoid_genitalia humanoid_penis long_ears male navel nude penis simple_background solo white_body white_fur devs-iratvs undertale undertale_(series) asriel_dreemurr_(god_form) boss_monster_(undertale) bovid caprine mammal 2015 hi_res|3500024115