Bro tokyolaika,
Lucky you, wish I was up there right now.
Feet and leg play is pretty popular and I am sure all of the La Siora Dominas are great at it.
It just comes down to your preference in appearance and style. If you like tall women then you might want to try Mistress Mao.
I have sessioned with her once when she was a baby dom. I am sure others here who have seen her more recently can vouch for her skills. She is also one of the more popular La Siora Doms at the moment.
Mistress Hikaru is also rather tall at 172 CM but I have never played with her.
Also don't worry about the pain thing - One major plus about Japanese doms is that they will cater the session to your desires and only cross a line if you let them.
This is in contrast to seeing a dom in another country such as the USA where some Doms don't give a crap about what you want and think you are only there to serve them and their needs.
Sorry to rant but I really hate the sex negative BDSM culture in the US - and I am American.
My vote for best ever La Siora Domina legs goes to retired Mistress Bigyoku.
Here are some photos from her - what nice long legs she has!!