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This is an encyclopedia of the cute-smiling Yamauchi Yayoi. We'll measure Yayoi's body thoroughly! After measuring the length of her tongue and the size of her nipples, we'll stimulate her nipples! She'll show us a look of ecstasy and pleasure. After that, we'll measure her belly button and clitoris. And we'll measure her vaginal temperature. How will the cute Yayoi react?