They know each other better than anyone else, with the exception of Midoriya. As shown below where Monoma is doubting Bakugou protecting someone else. Then Kirishima says he does that all the time and I guess you guys don't know him as much as I do.
Then in season four Bakugou was the one to inspire Kirishima's ultimate move Red Riot Unbreakable. When Kirishima was feeling self conscious and kept talking down on himself, Bakugou reminded him what he told him during the cavalry battle then said the below.
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Kiribaku Evidence/Proof
FanfictionI have a whole album in my camera roll full of kiribaku things that kind of convince me how it's a really good ship and could possibly become canon. Therefore I have decided to share some of it with you. Includes: -videos from the anime -comments so...