Niall hated his ex with more than his heart, he hated him with his mind and soul. There was one thing though the prevented him from being able to push him away and move on with his life and be happy with his boyfriend Zayn.
That one thing was the son that he shared with Harry.
NARRY/ZIALL
"I love you. Don't you love me back Harry?"
"Is that even a question Niall? Of course I do, always have loved you, always will."
Or the one about Harry and Niall, best friends, make out buddies, and lovers?