2girls, back, bathing, bathtub, completely_nude, facing_away, female_pov, from_behind, greyscale, hair_bun, hand_up, inoue_takina, kitaku_(nakamachi_machi), lycoris_recoil, monochrome, multiple_girls, nape, nishikigi_chisato, nude, partially_submerged, pov, same-sex_bathing, shared_bathing, water, wet