I wrote Batman/Superman fanfiction.
Here is the summary:
A solar anomaly leaves Clark Kent dangerously overcharged — glowing like a small sun and unable to touch anything without burning it. While the Justice League scrambles for solutions, Bruce Wayne locks himself in the Batcave, designing containment tech fueled by caffeine, stubbornness, and denial.
Clark isolates himself in orbit, terrified of hurting anyone. Bruce refuses to leave the comm line open to silence.
And somewhere between physics and feeling, he decides the only way to ground the sun… is to hold it.
Romantic tension ignites amid science, sarcasm, and half a dozen shorted-out circuits.
Because when the world’s brightest man meets its most immovable one, sometimes love looks a lot like heat transfer — and sometimes the sunrise over Gotham comes softly, already accounted for.
You can read the story on fanfiction archive here:
https://archiveofourown.org/works/72852761