Trying to clean up the 'what to do' part to read better:
[X] Ask for a few minutes to relax.
-[X] Tea?
[X] Mami:
-[X] Cuddles. Snuggles.
--[X] Brinapilot: If you want to doze off a few minutes, let it happen.
-[X] Ask her to check Riona's flask.
[X] Kirika:
-[X] Ask for extra Enchantments:
--[X] Handcuffs, something you can use on active enemy meguca.
---[X] Including one for Riona, for when she's woken up.
--[X] Bracelets you (all?) could wear for protection.
[X] Tell the Kures what happened.
-[X] Get opinions on Riona and on the repercussions of taking her prisoner.
[X] Discuss what to do.
-[X] Propose:
--[X] Today:
---[X] Informing meguca neighbors and Yuki about what happened.
---[X] Arrange prison transfer with Yuki, going over details about Riona's power.
--[X] Tomorrow:
---[X] Informing Nadia, Niko, and everyone else.
---[X] Bringing Rionna to Yuki's prison.
-[X] Follow consensus.
[X] Sayaka:
-[X] Congratulate your Kouhai on a job well done.
-[X] Thank her for comforting you.
[X] Thank everyone.
Also, is there a reason to not have an AM enchant on Riona's Soul Gem and one on her body? It's kind of paranoid, but is there a reason not to?