idolmaster, idolmaster cinderella girls, shibuya rin, shimamura uzuki, honda mio, unpokotan, 3girls, aqua eyes, armpits, arms up, ass, barefoot, bare legs, bare shoulders, bed, breasts, brown eyes, brown hair, cuddling, :d, feet, girl sandwich, legs, leg up, long hair, looking at viewer, lying, multiple girls, navel, nipples, nude, on back, on bed, one side up, on stomach, open mouth, parted lips, sandwiched, short hair, sideboob, small breasts, smile, viewed from above, yellow eyes