Yuzu and Lime - Jujutsu Kaisen 0 (Okkotsu Yuta)

Okkotsu Yuta x OC.

An angel of the flames meets her match: a tired and overly stressed boy with nothing to lose.
Takagi Yuzuha was afraid of hurting people, so she didn't approach them; she skipped classes and tried her best not to involve herself. Or so she thought until a strange cursed boy came knocking at her door.

(Cross posted on Ao3 under the same title by Rauressuyo.)
I came up with the title in two minutes I'm sorry it's irrelevant.