Your specific is My Brother's Keeper by Otterling. http://www.fanfiction.net/s/6180596/1/bMy_b_bBrother_bs_bKeeper_b
Here are 3 other de-age Cas fics all by Maychorian. Entertaining Angels http://maychorian.livejournal.com/75260.html#cutid1
The following two are -sort of- deaged Cas. But both stories are excellent. Rain Falling Down http://maychorian.livejournal.com/136067.html Coming Down on a Sunny Day. http://maychorian.livejournal.com/233162.html
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Date: 2012-02-29 06:30 am (UTC)Here are 3 other de-age Cas fics all by Maychorian.
Entertaining Angels http://maychorian.livejournal.com/75260.html#cutid1
The following two are -sort of- deaged Cas. But both stories are excellent.
Rain Falling Down http://maychorian.livejournal.com/136067.html
Coming Down on a Sunny Day. http://maychorian.livejournal.com/233162.html