I don't think it's just about the shouting and explosions, honestly. The real tension for me comes from how their entire history is built on this painful, messy foundation. Midoriya spent years looking up to Bakugou, and Bakugou spent years looking down on him, but both of those perspectives were built on a complete misunderstanding of each other's internal worlds. When that starts to crack, every interaction is charged. Like, Bakugou's apology after the license exam wasn't just a 'sorry'—it was him finally acknowledging Izuku as a person separate from his own ego, and that shift creates this massive, uncomfortable intimacy. They have to rebuild everything from the ground up, and every step is awkward and heavy.
A lot of fics I enjoy lean into the physicality of it too, but not in a purely romantic way. It's about two people whose bodies are their primary means of expression—one through controlled, precise power, the other through overwhelming, reckless force—learning to touch without it being a fight. A hand on a shoulder to stop a spiral, catching each other after a training session, those moments feel huge because their default language has been violence for so long. The tension isn't just 'will they kiss,' it's 'can they even exist in the same space without their past suffocating them?'
Some writers nail the quiet aftermath of big emotions. Bakugou yelling himself hoarse and then just... deflating, with Izuku there, not saying anything, just waiting. That silence after the storm is where all the unresolved stuff hangs in the air, and you can feel the characters mentally poking at it, trying to figure out what to do with this new, fragile thing between them. It's exhausting and compelling to read because it never feels easy or destined.