Looking for stories where Castiel has to care for or protect younger versions of Sam and/or Dean. Can be de-aged or just pre-series.

Specifically looking for stories where the boys are abused and Castiel is a doctor/pediatrician and is able to care for them, but other comfort stories work too. I think I read one where Castiel worked for CPS and had to care for the boys and I would like to find more of those as well.

If you know of any stories where Castiel has to gain wee!chester trust and comfort them that would also be awesome. Thanks!