I like the carpenters dream: Flat as a board and easy to nail...
I prefer girls that have A-cup size breasts but will settle for a small B-cup if I had to. As far as which girl would I want to feel, I would say Mizui Maki, when she was U15. Ah hell, I'd like to feel her up even now lol.

Otherwise, just about any one of the JuniorIdols with small breasts would work for me.