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I like the smug energy of Shion. It would be nice to be teased by her. Chloe is cute too. I like her chubby proportions. It would be nice to hug and knead her flesh.
Sex appeal isn't a one-dimensional factor, but rather a collection of traits, that can have very little overlap. Therefore a quantitative assessment is not possible without defining a framework of points of measurement and weight in the overall result. Then again breaking it down to a number, is kind of pointless and offers no significant insight, so why bother?