3girls :d :o ass back bath blush body_blush brown_eyes brown_hair commentary_request futami_ami futami_mami idolmaster idolmaster_(classic) long_hair minase_iori multiple_girls nude one_eye_closed onsen open_mouth partially_submerged puton same-sex_bathing shared_bathing short_hair siblings side_ponytail sisters sitting smile towel towel_on_head twins water