I finished Princess Celestia Sleeps In, thanks for the recommendation whoever waved it at me. I'm really engrossed in it - it's rolling and thoughtful and deliberate and patient, and it deftly breaks up its scenes with constant cuts to building tension and action beats. I also think it has one of the best portrayals of Princess Luna I've seen in fiction. So often people write her like she's just kind of cool, if a little weird, but here she's genuinely difficult. I can't wait to get into the sequel.