I would love it if Asami shared you with Sayuri! And then a mother/daughter threesome.It might be unlikely, but it would definitely be fun to include Sayuri in a MILF 3P with Yasuka after having the two of them become friends.
And then Sayuri nailing Yasuka with a strap-on as part of that maybe?
That leads into double penetration or a spit-roast. Yum!
DP sounds especially good