2boys, black_eyes, black_hair, box, brothers, carrying, christmas, christmas_ornaments, christmas_present, christmas_tree, covering_another's_mouth, elf_hat, gift, gift_box, hat, holding, holding_gift, hunter_x_hunter, illumi_zoldyck, killua_zoldyck, long_hair, long_sleeves, looking_at_another, male_focus, multiple_boys, parted_lips, shenshan_laolin, shirt, short_hair, siblings, white_hair