What happens when the wind and water pillar get sent on a mission and find a unexpected someone? I don't own demon slayer or any of the art used

[IN THE PROCESS OF REWRITING] A Sanemi Shinazugawa x Giyu Tomioka fanfiction. Sanemi Shinazugawa hated Giyu Tomioka. The way he was always silent, boring, and full of himself. Giyu Tomioka hated Sanemi Shinazugawa. He was such a dick, always so aggressive. Nothing could ever change how much I hate this guy. Main ship: Sanegiyuu Other ships: -Genmui -Uzuren -Obamitsu Warning! NSFW / language / alcohol ! None of these characters belong to me !