Alex "Lexi" Stone accidentally strikes Chrysalis while delivering pizzas. His punishment? To put up with her until she can return to Equestria, of course.
With piece between the changelings and ponies, and the two species, it's time for some learning on both ends. And for one little changeling it's really eye opening.
No one ever said being a new parent was easy, especially if your wife is a changeling. Regardless, there is a little one on the way, and Rhino and Gel will have to learn how to be parents, as well as dealing with the first pony-changeling hybrid.
Twilight's managed to accomplish the impossible. Peace between ponies and changelings. Everything was ready for this truly historic step...now they just need to move thousands of changelings hundreds of miles without causing a panic. Easy-Peasy.
What does Chrysalis do when she finds out someone else is leading her children? She loses it. (sequel to Starlight Glimmer: New Queen of The Changelings)
It's been a long time since the Changeling Invasion of Canterlot was repulsed and that Equestria has gone back to their usual Business. What nopony expects though...is that the enemy is far from defeated...and has already infiltrated them once again.
The story of how a former brony was forcibly ejected from Earth into a new form to become Queen Chrysalis's unwilling assistant in her revenge plot against those darn ponies is a long and interesting one. And it starts... now.