You have me interested in these type of stories. Just read the one that was suggested to you on your previous search. I think I may have found the one that you requested in this story request. Not sure but here it is: http://archiveofourown.org/works/4088272?view_full_work=true When the Bough Breaks by Le_Rouret

This isn't quite what you are looking for but it's similar:

Rain Falling Down Around My Ears by Laura of Maychoria (http://www.fanfiction.net/u/719622/)
Castiel goes back in time to stop the Apocalypse. Things go wrong. Things go VERY wrong. AU
Rated: Fiction T - English - Angst/Hurt/Comfort - Castiel & Dean W. - Chapters: 9 - Words: 37,120 - Reviews: 180 - Favs: 337 - Follows: 321 - Updated: 12-25-09 - Published: 07-27-09 - id: 5252384 - Incomplete
http://www.fanfiction.net/s/5252384/1/Rain-Falling-Down-Around-My-Ears
Note: Cas ends staying with Bobby while in the body of a younger Jimmy.

Then there's these fics (both fics are Destiel):
Key Lime Pie, Visions and Secret Kisses by darkphoenix2345 (http://www.fanfiction.net/u/2638975/)
AU-HS Castiel Singer is a regular high school senior when all of a sudden he starts experiencing debilitating migraines and visions of people in peril. He is unwillingly thrust into the world of the supernatural. And what does fellow senior, Dean Winchester have to do with all of this craziness? [High School AU]
Rated: M - English - Romance/Supernatural - Chapters: 27 - Words: 88,677 - Reviews: 192 - Favs: 52 - Follows: 86 - Updated: 7-10-13 - Published: 2-22-13 - Dean W. Castiel - Complete
http://www.fanfiction.net/s/9037787/1/Key-Lime-Pie-Visions-and-Secret-Kisses

Dean's Got Himself A Cas by smellslikesalvation (https://www.fanfiction.net/u/5011580/smellslikesalvation)
John finds out. One-shot (Rated T, but has harsh language)
Rated: Fiction T - English - Romance - Dean W., Castiel, John W. - Words: 5,688 - Reviews: 20 - Favs: 112 - Follows: 7 - Published: Aug 21, 2013 - Status: Complete - id: 9617449
https://www.fanfiction.net/s/9617449/1/Dean-s-Got-Himself-A-Cas
Note: Told in John's point of view and the fact that Cas was adopted by Bobby is a sidenote.