Shout-Out: Annex by Rich Larson

When the aliens invade, all seems lost. The world as they know it is destroyed. Their friends are kidnapped. Their families are changed.

But with no adults left to run things, young trans-girl Violet and her new friend Bo realize that they are free. Free to do whatever they want. Free to be whoever they want to be.

Except the invaders won't leave them alone for long...