How could Cedric deal with the discovery that Harry's abused fanfiction exists?

Cedric would be deeply troubled. In the wizarding world, they have their own code of honor and respect. Finding out about Harry's abused fanfiction would go against everything Cedric stands for. He might start to question the morality of the Muggle world that allows such things to be written. He would also feel a sense of sadness for Harry, knowing that someone out there has created a story that portrays him in such a negative and harmful light. Cedric might even consider taking some sort of action, like talking to Harry about it or trying to get the fanfiction removed if he could, though that would be a complex matter given the nature of fanfiction and the different worlds they live in.

Cedric would probably be very angry.

He might be shocked at first. Then he could feel a strong sense of protectiveness towards Harry. Maybe he immediately tries to find ways to keep Harry safe from further harm, like staying closer to him at all times.

It could lead to a new adventure for Harry. He might decide to fight against the abusers and protect the students, which would add a new layer of conflict and action to the story.

Harry would probably be curious about it in a way. He might secretly read some of it to understand why people are so interested in this pairing. Ron, on the contrary, would actively try to stop people from talking about it. He'd say it's disrespectful to Hermione and their friendship. He might even try to get Hermione to tell people to stop writing such fanfictions, but Hermione would likely be more understanding of the concept of fanfiction and not be as bothered as Ron.

Cedric might first talk to Harry privately to get all the details. Then he could go to Dumbledore for help.

In this kind of fanfiction, Cedric might feel shocked and angry. He could decide to protect Harry from further harm. Maybe he'll try to find the abuser and put a stop to it.

Well, in 'Harry Potter and Cedric Diggory mpreg fanfiction', a theme could be the relationship between Harry and Cedric in this new and unexpected situation. How do they support each other? How do their friends and family react? Also, there could be a theme of the magical implications of male pregnancy. Does magic play a role in making it possible? And how does it affect Cedric's magical abilities during the pregnancy? It's all very speculative and not in line with the original canon, but that's the nature of such non - traditional fanfiction.

They might be shocked at first. Then they could try to protect Harry from further harm, perhaps by confronting those who abuse him or by providing him a safe place to stay.

Well, in some fanfictions, Cedric might use his magical skills to shield Harry from physical attacks. For example, he could cast protective spells like Protego Maxima to create a strong shield around Harry when they are in danger. Maybe in a situation where dark wizards are attacking, Cedric steps in front of Harry and uses his wand to fend off the spells aimed at Harry.