This is actually a well-known, if perhaps not common, circumstance with these two. However, I can only think of two examples right now, probably because it's also popular in the reverse, and I'm getting my stories confused.
First is "The Praxian Solution" by Wicked3659: http://archiveofourown.org/works/4392017
The second is Dellessa's (possibly abandoned) "Song of a Broken Spark:" http://archiveofourown.org/works/3101987
Oh, and while I wouldn't call it dark, Riczobact's Festival of the Five series does feature Jazz helping a Prowl who desperately needs it, specifically in the first story written, "Winner Takes All": http://archiveofourown.org/works/4583418
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timeasmymeasure
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Date: 2017-04-05 12:37 am (UTC)First is "The Praxian Solution" by Wicked3659:
http://archiveofourown.org/works/4392017
The second is Dellessa's (possibly abandoned) "Song of a Broken Spark:"
http://archiveofourown.org/works/3101987
Oh, and while I wouldn't call it dark, Riczobact's Festival of the Five series does feature Jazz helping a Prowl who desperately needs it, specifically in the first story written, "Winner Takes All":
http://archiveofourown.org/works/4583418
Hope you find something you like!