jumping dogeza, kousaka kirino, kousaka kyousuke, ore no imouto ga konna ni kawaii wake ga nai, 1boy, 1girl, :d, aged down, aqua eyes, ball, barefoot, beachball, black hair, blue eyes, blush, brother and sister, brown hair, child, family bonding, feet, hair ornament, hairclip, hose, hug, octopus, open mouth, pool, short hair, siblings, skirt, smile, splashing, swimsuit, toes, wading, wading pool, water, water gun