[I'm just assuming here that Katsuki doesn't need to be prepped while in heat because otherwise he may be in for some pain here...because Izuku has nothing to use and no mindset currently to even be thinking about that. With the pseudo-permission granted he's already moving, pressing his face again to the side of Katsuki's neck as he guides himself in, letting go when he's able.
It's...going to be a lot, for both of them. Even if it doesn't hurt it's shockingly tight, causing Izuku to stutter his hips with a thick, surprised gasp.]
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It's...going to be a lot, for both of them. Even if it doesn't hurt it's shockingly tight, causing Izuku to stutter his hips with a thick, surprised gasp.]