2boys alternate_universe arm_up belt black_hair black_jacket black_pants blue_background blue_eyes bubble demon_slayer_uniform fighting_stance floating_clothes floating_hair haori hcl_sabigiyu highres jacket japanese_clothes jumping kimetsu_no_yaiba leaning_forward long_hair long_sleeves looking_at_viewer male_focus medium_hair multiple_boys pants pink_hair red_jacket sabito_(kimetsu) scar scar_on_cheek scar_on_face standing tomioka_giyuu v_arms water waves white_jacket wide_sleeves  2boys ^_^ alternate_hairstyle alternate_universe animal bird blue_theme closed_eyes crossed_arms feeding haori hcl_sabigiyu high_ponytail highres japanese_clothes kimetsu_no_yaiba kimono laughing long_hair long_sleeves looking_at_animal looking_down male_focus monochrome multiple_boys pants ponytail sabito_(kimetsu) sandals scar scar_on_cheek scar_on_face simple_background sketch smile squatting tabi tomioka_giyuu wide_sleeves zouri  2girls breasts closed_eyes closed_mouth comb facing_ahead from_side furrowed_brow hair_down hairdressing happy hcl_sabigiyu highres japanese_clothes kimetsu_no_yaiba kimono kochou_kanae kochou_shinobu long_hair long_sleeves looking_at_another monochrome mouth_hold multiple_girls obi sash serious short_hair siblings simple_background sisters sketch smile tasuki