"In this moment I'm not sure how I've said no to him for fifteen years. Peeta Mellark hasn't smiled like that since the day on the rooftop of the Training Center before the Quarter Quell." My take on Katniss's decision to have children with Peeta.

Following their return to District 12 after the war, Katniss and Peeta grow back together.

This is a missing moment from Mockingjay and, as such, contains spoilers for all three books. This is how I imagine Peeta and Katniss grew back together, and how Katniss was able to finally come to terms with her emotions in the final lines of the book.