2boys, bald, bed, black_hair, blanket, chibita, closed_eyes, facial_mark, heart, heart_in_mouth, lying, male_focus, matsuno_karamatsu, multiple_boys, on_side, open_mouth, osomatsu-kun, osomatsu-san, sleeping, tank_top, thick_eyebrows, tsubuta_hiro, under_covers, whisker_markings