Many years ago, I watched my wife doing this with another woman! It was her secret fantasy to do it. So, it was arranged one night after a few drinks to get us in the mood!
My girlfriend loves this one, way too short but packs a wallop. Not a seduction as much as an intimate interaction which happens to lead to sex because both women are in touch with their sapphic side and let it flow out because the time is right, simple as that.