COLLEGE AU 😫😫😫 ok hear me out:
We know that Zayne is 27, Valko is 26, and Caleb is 25. Considering Zayne prolly stayed away from Linkon from Primary to,,, maybe Uni? Caleb also moved away to study, and Valko... Well, we don't know but indulge me on this.
WHAT IF THEY ATTENDED THE SAME UNIVERSITY?
Like it was on accident, since the 3 of them are rlly smart n talented, they were able to attend the top university of the world or something.
They're all in different fields but it's still in STEM, and they probably share the same location, if not the same building (probably not tho).
Zayne first arrived and he's amazing, top student in Science, etc. In his 2nd year, he made friends (maybe thru competition or whatever) with a Technology student, Valko. Two years after that, he finds a familiar name on top of the Engineering leaderboard, specifically in Aerospace and Aviation: Caleb, who was on his 2nd year by then.
Zayne is on his 4th year but since he's medical field,,, 8 years to graduate, I think? Valko's on his 3rd year.
Before Caleb, Zayne and Valko would just pass by each other, say hi, maybe nod at each other, but never really hang out. Until Caleb.
Apparently Valko has been chatting up both upper and lowerclassmens, making friends everywhere, and Caleb fits his vibe so they quickly became friends. After Zayne and Caleb rekindled, Caleb invites both seniors out to drink. One night, Zayne ended up super drunk and the three stumble their way to Zayne's dorm room. Making sure he doesn't die, the other two slept over, and that bonding experience has changed the status of their friendship ever since.
I imagine midterms and finals week are the most fun, because it's 3 super smart geniuses trying to not die from over-studying, and it actually helps because being with each other helps with their nerves. They go to Zayne's room, bc it's clean.
It's also cute because there's no competition. No one's beating anyone. They can be the top students of their respective fields, so there's no friendship-breaking pressure to win against one another.