Less Than Perfect by Kelly Jensen
Mikayla's read every book in her collection of post-apocalyptic novels at least twice. She thinks she's prepared for aliens taking over Earth. She's not.
Nor is she prepared for the attention of a good-looking refugee named Reg.
All Mikayla and Reg want is a safe place to see out the end of the world, hidden away from the aliens that call themselves The People, but cities of the depopulated United States not infested with The People are rife with gangs, the detritus of civilization and disease.
On a mission to restock their supplies, Mikayla and Reg are captured by The People and prepared for the procedure that will make them perfect, but no longer quite human. In order to escape, they need to rely on each other...if Mikayla can trust a man who seems too good to be true.