Yukiho = oppai = does not compute
None of the 765 idols have enough filling, save for Azusa.
With regards to the mousepad, I don't think it (or any other oppai mousepad, for that matter) will last for long. Especially the portions where you rest your wrist and the face area. Repeated use will probably wear out the areas, spoiling the beautiful designs.
Of course, you could always buy it and put it on display, but that would be a bit wasteful, paying so much for it and not using it for its original purpose.