1boy, aged_down, bad_twitter_id, bara, boku_no_hero_academia, bssku, demon_boy, demon_horns, demon_tail, demon_wings, detached_sleeves, endeavor_(boku_no_hero_academia), feet_out_of_frame, from_behind, horns, large_pectorals, long_sideburns, looking_at_viewer, male_focus, monsterification, muscular, muscular_male, nude, pectoral_press, pectorals, short_hair, sideburns, sitting, solo, spiked_hair, tail, tail_raised, thighs, unamused, wings