I saw Yoko twice and was happy with her service. I used to see both Mika and Annie a lot when they were at Candy, stopped seeing Mika as her melons were too big for my liking. Yoko too though smaller than Mika's and not much fun to play with. I liked Yoko as I found her very friendly and got DFK, BBBJ from her but FS was covered. Never had BBBJ from Mika. Yoko is genuine Japanese, from Nara. Her English is better than conversational. Mika is of course much prettier than Yoko, younger too. My best guess of Yoko's age is late 30's. Both Mika and Yoko are way too busy, not worth making the trip there if one doesn't like making appointments.
Having said all that, I will probably stick with Annie at Hangzhou in the long run as nobody can beat Annie's passionate kisses.