Fics like Firsthand Lessons

Witches were not meant to be understood. They're much too dangerous to be studied in a contained environment even by the most curious of Magical Girls, and it worked to the Incubators' benefit to ensure Magical Girls could only ever think of them as inexplicable and frightening. Nonetheless, living things, even magical ones, have underlying biology which dictates how they work. …Being in a relationship with what must be some of the first tame Witches to ever exist means that Homura is finding herself learning things about their bodies she was not aware of before.

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