I assume it's because Breast Expansion got there first... but yes, it's one that doesn't make a great deal of sense... but then, one might argue that becoming sexually aroused at the prospect of a body rapidly expanding is rather silly too.
Naturally, that accusation can be levelled at most transformation fetishes, fetishes, human behaviours, humans and the universe in general.
But y'know - if there are any questions about FTF10 - you can ask those too.
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