by Europa
She would never let Chrysalis know, but every night she stayed up long after her wife had fallen asleep, refreshing the wards on their room, worrying endlessly. Twilight would sit up in their web-bed, looking down at the changeling as she slept, her barrel rising and falling slowly and evenly. Worried that somepony rebelling against their love would come crashing through the window, Twilight only slept when she could keep her eyes open no more.
A month after their honeymoon, Twilight still couldn't relax. Every night was like this. Being careful not to wake Chryssy, she got out of bed and trotted through her castle aimlessly.
She walked to one of the balconies and looked at the night, out at Ponyville, at Equestria. It seemed like anypony could be out there, plotting her and Chryssy harm. There were six million ponies in the country, after all. That was a lot of people for there not be at least somepony out there. Maybe she could put some more protective wards around their room. Or their castle. Two more, five more, ten never hurt anypony...
A figure flew before her, swerved around to her, and approached. Twilight took a few steps back, allowing Luna to land safely and fold her wings. "Twilight, what keeps you awake this night, along with all other nights since your wedding?"
She laughed nervously. "Oh, you know about that."
"You haven't been dreaming. Everypony dreams every night, whether or not they realize it. You have not been; what is wrong?"
She wasn't going to get anything by Luna, was she? She had born Honesty centuries ago. "I'm scared, Luna," Twilight admitted. "You know how many ponies were against me dating Chryssy, who knows what they'll do now that... you know?"
Luna smiled gently at walked over to her side, draping a long wing over her withers. "Your worries have a note of sense within them, Twilight, but you worry too much. While it is true many of our little ponies oppose your union, not many would have the nerve to strike against a Princess and Queen's Consort, or a Queen and Princess's Consort. Fewer still have the ability to harm you."
"What do you mean?"
Luna poked her in the chest. "Consider, Twilight. Your friend Applejack bucks trees for a living. Your friend Pinkamina's sister, Maud, was able to shatter stone. Disregard the strength; how tough must they be so that, when they and their charges meet, they are not the ones who break?"
"Pretty tough." She had an idea where it was going, but Princess Luna continued regardless.
"Now you are an alicorn. Poison can not touch you, for the ichor in your veins simply burns it out. You possess earth pony magic in the extremes, so it will be... difficult to harm you. Changelings are naturally impervious to toxins as well, and their magic must - by the nature of their disguises - mimic earth pony magic in some regards. Whatever they wish, they can not harm you."
"And... and my friends?" she realized. Oh no. Had she been warding the wrong place? What if they were breaking into Rainbow's cloud house right now? Or Rarity's store? What if they wished to go through her friends to get to her, what if -
"Twilight Sparkle," Luna said sternly as she tightened her wing's grip. "You worry too much. We've assigned night guards to them, and your wife herself has Imperials under disguise shadowing your friends from a respectful distance. Please Twilight, go in and get sleep. This is coming from the mare who was once driven to madness by ponies sleeping at night, so go." With some bizarre movement of Luna's wings, Twilight was pushed towards her castle.
"Luna - "
"I'm not saying don't take care of yourselves, Twilight," Luna said. "But do try not to worry yourself too much over it. You don't want to know what stress-aging does to somepony who's immortal."
She nodded, then trotted back inside her castle. Twilight found her wife still fast asleep on her side, so she nestled up against her stomach as the little spoon, feeling her shell moving as the changeling breathed.
She closed her eyes and slept.