Well, in the fanfic, Adrien might tell his dad a joke like 'Dad, do you know why Hawk Moth has such a big cape? Because he's trying to hide his lack of fashion sense under all that fabric. Hawk Moth is so focused on being evil that he forgets about style.' This kind of joke plays on the character's rather outlandish appearance. Also, it could be that Adrien is just trying to lighten the mood at home with his dad by making fun of the villain they both know so well from their experiences in the Miraculous world.
Maybe Adrien says, 'Dad, why is Hawk Moth always so gloomy? Because he's in a bad'mood' (as in his evil plans).'
Because he wants to make his dad laugh. Simple as that.
Maybe the joke is 'Why is Hawkmoth always so stressed? Because he has too many akumas to manage!'.
Maybe his dad gives a small smile and a nod. He could be a bit reserved in his reactions but still show that he appreciates Adrien's attempt at humor. He might say something like 'That was quite clever, Adrien.'
There are multiple consequences. Firstly, his relationship with his father will be forever changed. He'll no longer be able to trust him in the same way. Secondly, his relationship with Ladybug might be affected. She may be more cautious around him, not knowing if he'll side with his father. Thirdly, Adrien will have to face the public's reaction if the truth ever gets out. He could become a target or be shunned. All of these aspects make for a very intense and emotional storyline in fanfiction.
He might be shocked at first. In many fanfictions, Adrien would feel a mix of disbelief, anger, and sadness. He has always known his father as a strict but loving parent, and finding out he's Hawk Moth, a supervillain, would completely shatter his view of him.
Well, perhaps the fanfic is about a world where cats can talk and Adrien is sharing with his dad all the funny cat - related puns from this fictional world. For example, the cats might make puns about their favorite fish or the warm spots they like to nap in.
The funniest part could be when Adrien makes a really cheesy cat pun that catches his dad off - guard. For example, if he says 'Dad, this cat is so cool, it's the cat's meow!' and his dad just bursts out laughing at how corny it is.
Well, perhaps Adrien has been reading a lot of cat - themed books or stories that are full of puns. He decides to tell his dad these puns to brighten his day. For example, he says 'Dad, I heard that cats are great at multi - tasking. They can nap and look cute at the same time!'. His dad might then join in and they could have a fun time coming up with their own cat puns.
Since I don't know the specific content of this fanfic, it's hard to give a detailed summary. However, if we think about it, perhaps in the story Adrien uses cat puns to amuse his dad. It could start with Adrien seeing a cat and then coming up with a series of puns based on the cat's behavior or appearance. For example, if the cat has big eyes, he might say 'Dad, that cat has eyes like saucers, it's so meow - velous'.
Well, it depends on how much his dad knows about Cat Noir. If he doesn't know much, he might be a bit confused at first. He could ask Adrien what exactly a Cat Noir fanfic is all about. Maybe he'll be dismissive if he thinks it's just some silly fictional thing that distracts Adrien from more 'important' matters. But on the other hand, if he realizes it makes Adrien happy, he might be more accepting in the long run.