Draco might become withdrawn. He could isolate himself from his friends and spend more time alone in the Slytherin common room, brooding over what Harry has done to him.
There's also 'Fractured Bonds'. In this fanfiction, Draco breaks Harry's heart by siding with the wrong crowd at a crucial moment. It could be that Draco is pressured into doing so, but the result is Harry feeling betrayed and his heartbroken. This often leads to a downward spiral for Harry as he tries to come to terms with what has happened.
Draco could be seen as the main antagonist. Since the title implies that Harry breaks his face, it's likely that Draco did something to provoke Harry in the first place. Maybe he was bullying Harry's friends or being his usual snobbish self towards Harry.
Well, it could be a story where there's a huge fight between Harry and Draco. Maybe Draco says or does something really offensive to Harry or his friends, which makes Harry lose his temper and accidentally break Draco's face. Then it might deal with the consequences, like how the Hogwarts staff reacts, and how Harry feels guilty about it afterwards.
At first, Draco might be in shock. He didn't expect Harry to break up with him at such a crucial time. Then he could try to reason with Harry, begging him to stay for the sake of their unborn child. When Harry refuses, Draco could turn to his own family for support and close himself off from the outside world for a while.
One possible reason could be a misunderstanding. Maybe Harry misinterprets Draco's actions or words in a way that makes him do something that breaks Draco's heart. For example, if Draco is secretly trying to help Harry but Harry thinks he has some malicious intent and publicly shames him.
There could also be a chance for reconciliation in the future. Maybe they both realize that they made mistakes during the break - up. Draco could change his ways a bit more and Harry could be more understanding. Fanfiction often has these kinds of arcs where characters get a second chance at their relationship after some growth and learning.
When my cousin broke his nose during a basketball game, the shape of his nose was so odd that it looked like a little hill. And every time he tried to blow his nose, it made this really funny whistling sound. It was so hard not to laugh when he was around.
The relationship between Harry and Draco in this fanfiction would be greatly affected. Since Harry has a connection to Draco's mom, Harry could become more empathetic towards Draco. He may realize that Draco is not just the bully he once thought. Draco might struggle with the idea that Harry has this special connection to his mom. However, as the story unfolds, they could learn to communicate better. Harry could share insights about Draco's mom that Draco never knew, and this could bridge the gap between them, leading to a less hostile and more nuanced relationship.