If Usagi (or any of your muses) happens to have some previous game experience, I'd love to see them over at wethelost. It's a CRAU game based around helping to raise and shape a young god in a rural little village of hobbit houses. It's slow-paced and very backtag friendly (backtags count for AC and can be used as part of the wishing system). It is more on the slice of life side of things, but there have been events that run the gamut of genres. We have a Makoto there who would love a castmate!

And if you're looking for something for Olivia and don't mind her being transformed into a pony, there's a Nephenee at mylittlejamjar who's also always in the market for castmates!