Life gets boring when you're a god-immortality is a literal eternity, and there's only so much you can do. So when a mortal enters Katsuki's temple seeking sanctuary, he's excited to FINALLY have some entertainment. He offers a deal-refuge in his domain in exchange for companionship. Who knows, this mortal could end up being quite fun after all...
Dis be Kats x Lukas and uhhhhhhhh-Kats is a god and Lukie is...an anxious bean-also in the pantheon is Ren, Deku, Todoroki, and Idk whoever else I decide to throw in-