Shou Nishino is one of my favorites, FWIW. I've seen quite a few of her vids over the years. She looks better now at 30 than she did when she started in 2004. She hasn't changed much in 10 years, just a little more broken in and in a good way! Those yummy hips!!
As far as the gal being the sister of Shou in the video you mention, I don't think I would make that guess without you mentioning it, but considering siblings can look very very different and plastic surgery being able to make people even more different than they were originally, there is no way to rule it out. They aren't that different that they absolutely couldn't be related.
I do find that the actresses in that video charming in their own ways. Good find, sisters or not!
