i'm going to soulmate au this just because.
they meet in a bar brawl when baekhyun accidentally spills a shot all over kyungsoo while being too rowdy and kyungsoo is already in bad mood so he grabs baekhyun's collar but ofc the red thread chooses that moment to appear between their wrists, intwining their fates together.

---

baekhyun is still grinning stupidly at their wrists and kyungsoo wants to wipe that grin off except considering the current ... circumstances his mind helpfully supplies a few other ways he could shut baekhyun up.

---

then the next week baekhyun shows up at kyungsoo's house like oops got kicked out please take me in, soulmate! kyungsoo leaves him begging outside in the cold and only opens the door when baekhyun starts singing beyonce songs loudly and kyungsoo hears his neighbours starting to yell complaints

---

baekhyun worms his way into his life and under his skin until one day kyungsoo catches himself adding fruit loops to his basket instead of his usual bran because baekhyun made a comment about wanting to try it.

---

before this, they've just lived as normal roommates, though baekhyun keeps trying to bring up the soulmate thing and kyungsoo pretends he doesn't see the hurt in baekhyun's eyes every time he brushes baekhyun off.

---

so he goes home and throws the box of cereal in baekhyun's face. "here's your stupid diabetes recipe. and baekhyun, let's try."

---

baekhyun frowns. "diabetes?"

---

"no, being soulmates."

---

and baekhyun tackles kyungsoo so hard his head hits the wall and kyungsoo has a bruise that lasts a week.