Something is bothering Celestia, enough to keep her up all night, every night. Enough to risk her screwing up, and revealing to all of Equestria what she is behind the facade of serene wisdom - a bizarre idiot. Thankfully Luna is on the case, determined to figure out what's going on with her sister, and help if she can, at least if they can stop bickering long enough to do that.
Possibly the dumbest Twilestia fic you'll ever read.
Sex tag is for sexually implicit dialog and situations.