College AU hc: Rin's the only thing keeping the others sane because he keeps cooking for them and listening to their rambling without complaining, even though he's not actually a student, he's just Yukio's brother with two part-time jobs. Also, everyone's at least a little smitten, because he's a darn cutie, but not even Izumo would ask him out because overprotective!Yukio, that's why.
I LOVE THIS SO MUCH. I’D NEVER EVEN THOUGHT OF THIS BEFORE BUT ITS JUST SUCH A GOOD AU I MEAN I SWEAR TO GODS IM GONNA WRITE A FIC FOR THIS.
But on another note, you know those ducks that people working with computer codes recite their code to when they can’t get something right? well thats what everyone uses Rin as. Whenever they’re having trouble with one of their subjects they find Rin and explain it in vivid detail to him. He ends up learning quite a lot from all of them and becomes a jack of all trades kind of guy