Izuku and Shouto, when they're much much closer friends, stay up late in the sitting room of the dorms, talking about everything and anything. One night, they start talking about things that frighten them most, and it comes out that Izuku would be terrified to lose Shouto. He stammers, "I know you would feel the same! After all, we're friends, it's only natural..." But Shouto can feel the atmosphere in the room change, and while he wants to hear more about it, he just smiles and says, "I do."
considering they’ll be classmates for three years they will most definitely become super close friends.
i can imagine the whole convo spurring a few days after a really tough fight with a villain, where there was this really close call where shouto nearly died. izuku confesses he’s scared of losing shouto not only b/c they’re generally talking about what frightens them the most, but because he’s been having nightmares of shouto’s near-death over and over again.
though recently in izuku’s dreams it hasn’t been near-death so much as it was outright death, and that–
that is an outcome izuku is terrified of.