2girls, barefoot, bikini, blue_bikini, blue_ribbon, breasts, brown_eyes, brown_hair, collarbone, frilled_bikini, frills, futami_ami, futami_mami, hair_ribbon, idolmaster, idolmaster_(classic), idolmaster_million_live!, looking_at_viewer, medium_hair, multiple_girls, navel, pink_bikini, pink_ribbon, ribbon, shuucream_(syuichi), siblings, sisters, sitting, small_breasts, smile, swimsuit, toes, twins, two-tone_background, yellow_background