2girls, ass, bikini, blonde_hair, blue_sky, bob_cut, breasts, brown_eyes, brown_hair, cloud, day, from_behind, green_eyes, hagiwara_yukiho, halterneck, hirama, horizon, hoshii_miki, idolmaster, large_breasts, long_hair, multiple_girls, ocean, one_eye_closed, outdoors, pink_bikini, rainbow, short_hair, side-tie_bikini_bottom, sky, smile, spanking, string_bikini, sunlight, swimsuit, water, white_bikini, yuri