Back to school/non-AU adult boys in class
I know there are lots of High school and college AUs, and a goodly number of weechester/pre-series stories showing the boys in school or Sam in college. But I'm wondering if there are any stories out there where, due to a case or some other similar reason, Dean and Sam (and preferably Castiel too) have to go undercover as students (or teachers) at a college or university, or maybe a domestic fic where, having settled down, they choose to go back.
I prefer gen or non-explicit het or destiel - please no incest of any kind. I'm not interested in significantly AU stories, but if you'd like to post them for future searchers who might come across this, please just label it clearly. Same goes for RPF/J2/etc.
Thanks for whatever you can recommend!