The 2nd Community is Sentinel Bingo at AO3. This has some wonderful stories and hopefully you'll find something you like here. https://archiveofourown.org/collections/SenBingo/works
The 3rd Community is The Sentinel Secret Santa. It was so great this year. Some of the stories are just awesome. Don't believe me, check them out. Again, this is for the Sentinel Fandom.
https://archiveofourown.org/collections/2018_TheSentinel_Secret_Santa
Hugs, Patt