Derek is being pressured by his family to pick a mate, and somehow stumbles into a choice that they didn't expect and aren't sure they approve of....

Every single school had one: someone at the top of the food chain. An acme. Someone who could do things under a teacher's nose, escape consequences, and terrify other people. Someone who looked down on everyone else like they were prey. An apex predator. And Izuku couldn't count on teachers and adults to protect anyone. Even a hero school wasn't safe from the phenomena. When Izuku gets to Yuuei, he's determined to find out who it is and ensure they can't hurt him or his new friends. ...and accidentally, in the process, becomes the apex predator (though he is mostly unaware of this, and uses it for good. But still, people are terrified of him.) (Or, a snowball chain of events wherein Izuku's paranoia leads to 1A becoming a family, everyone in school being in debt to him, Aizawa adopting everyone in his sight and slowly growing closer to committing acts of arson, the League gaining redemption and working with the resident Apex Predator to combat the Hero Commission whilst gaining technically legal identities, and Hawks finding a family. Hurt people help other hurt people, and they're all doing their best. Some laws may or may not be broken in the process.)