What if...
In after it continues to go downhill with Harry's behavior.
The last chapter of After, Harry kills Tess.
Then, the epilogue explains it all.
Harry fell into a coma at a young age after being beat by his father. The whole thing was his dreams in his coma and representations of what he thought and hoped his life would be after he wakes up. He dreams about being an awful person, because he knows thats what happens to messed up kids like him. He dreams of hating his father, but secretly being happy for him finding the right lady.
And of course, he dreams of Tess. Of finding a girl who hates him, but loves him at the same time. Who comes back for him, because they love each other.
He dreams of the nightmares to come when he's past being ten, and finding true love.
Now, as harry's behavior is becoming erratic, he is stirring.
The end of the many year long coma is coming to an end. And his dreams know that, too.
When he wakes up, he is now not a little boy anymore. When he sees Tessa in real life, he kills her, so surprised to see the girl of his dreams and so confused between reality and the life he was living while he was asleep.
After he wakes up