2girls, aged_down, alternate_eye_color, black_eyes, black_shirt, blue_hair, blunt_bangs, brown_background, couch, denim, ear_piercing, empty_eyes, hair_intakes, jeans, kotonoha_akane, kotonoha_aoi, long_hair, long_sleeves, looking_at_another, lying, multiple_girls, on_back, on_couch, one_side_up, open_mouth, overalls, pants, piercing, pink_hair, shirt, short_sleeves, siblings, sidelocks, simple_background, sisters, sitting, sitting_on_person, smile, striped, striped_shirt, toriniku29, voiceroid, white_shirt