The Killing Vigilante

Izuku Midoriya is the son of a very powerful villain, one that didn't want his son involved in his line of work. On the villains way out, he encountered his nemesis, forcing him into seclusion. Later his nemesis married his wife, and there were two kids the same age in the Yagi household. Izuku's stepsister, Izuma Yagi. Izuku still doesn't know his father, so what happens when Izuku is forced to hide his quirk, enduring the torture of every day life?