A headcannon that one day Saeyoung just starts calling MC his girlfriend for no reason at all, jokingly, and MC rolls with it, calling him her boyfriend. Fast forward, they're best friends, still referring to one another as their s/o, and then... nothing changes. They continue doing it, but now their friendly hugs turn into kisses, their short cuddle sessions turn into them sleeping together. Promise rings turn into engangment ones. They don't even notice. They don't really talk talk about it.
then one day she gets pregnant and then they finally notice
- well fuck lol
as soon as i’m done with my last damn essay i’ll post i’m so sorry guys v.v