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adolescent alternate_universe anthro asriel_dreemurr black_clothing black_underwear blonde_hair boss_monster_(undertale)bottomless bovid boxer_briefs caprine clothed clothing collarbone colored_sketch eye_bags fangs goat green_eyes grey_clothing grey_shirt grey_topwear guide_lines hair hopefulsparks horn humanoid loose_shirt male mammal monster mushroom_print no_shading one_eye_closed pawpads paws print_clothing print_shirt print_topwear shirt simple_background sketch sleepwear solo tan_background teeth topwear undertaking_(hopefulsparks)undertale undertale_(series)underwear white_body young