2boys, black_eyes, black_hair, blood, blood_in_hair, blood_on_face, brothers, closed_mouth, hand_on_another's_head, hunter_x_hunter, illumi_zoldyck, killua_zoldyck, long_hair, looking_at_viewer, male_focus, multiple_boys, shenshan_laolin, short_hair, siblings, tongue, tongue_out, white_hair