/fantasyAU/
Sometimes before his rut, Katsuki becomes a bit feral and possessive, it's like a domination game. Everything's fine, he knows that Deku can take his shit, and if he takes the opportunity to analyze the alpha behavior, he can't complain.

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During a training trip, Katsuki falls into a rut faster than expected. Setting up a camp and a rough nest, alpha Katsuki tries to knot our Izuku. However a knot requires preparation and specific time.
Stop trying to stretch his ass

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