Duet
chevyroscoe
Everything's better in song.
At least, that's what Izuku thinks.
In which Katsuki and Izuku reunite after ten years, gets dropped into an entirely different reality by a too enthusiastic man in a suit, are put in rival groups, dip their fries in milkshakes in neutral territory, confronts with their suppressed feelings, beat up Izuku's fake ex, and must sing and dance their heart out in order to go back home.
Not exactly in that order, but hey, what could go wrong?
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More chapters posted and can be found on my Archive of Our Own, my user is spicykatsudon, enjoy :))