Changing a Villains Heart

In the world of Boku no Hero Academia, this fic won't follow any of those characters.

They have always been friends. Even when they were kids, Sophi and Spencer had been inseparable. They never asked each other questions when they saw the bruises, but they would always help heal the bruises and pain.
Even through high school, in two separate schools, they managed to stay close.
It's strange really, Spencer's parents are villains and Sophi's mother was a hero, but that never mattered anyway, as long as they had each other.

Now, when both of them are out of high school, they move into an apartment together. But there's something they each have to keep a secret.
Sophi had become a villain, the villain known as Stress.
Spencer had gotten his hero license and became the hero known as Night.
Night has been put on a mission to apprehend Stress, and Spencer knows that Stress is Sophi.

Now they both have to struggle, Spencer to try and change Sophi, and Sophi to see the good in people.