2girls, aiba_yumi, asymmetrical_docking, bad_twitter_id, beach, bikini, black_bikini, blonde_hair, blush, breast_press, breasts, cleavage, cloud, groin, half_updo, halterneck, hojo_karen, idolmaster, idolmaster_cinderella_girls, large_breasts, looking_at_viewer, multiple_girls, navel, o-ring, o-ring_bikini, orange_hair, outdoors, rum_raisin_(chihiromakita19), short_hair, side-tie_bikini_bottom, sideboob, smile, sweatdrop, swimsuit, underboob, white_bikini