Naruto is often full of surprises. He might first act all nonchalant and say it's just a new thing he's trying. But when he sees Anko's serious face, he would start to panic a bit. He could try to make a joke out of it, like 'Hey, Anko - san, this fanfiction - drink is supposed to make me write better ninja stories!'. In the end, if Anko doesn't buy his story, he would probably just bow his head and admit it was a stupid idea.
If Anko catches Naruto 'drinking' fanfiction, Naruto's reaction would be quite complex. He's a bit of a daredevil and often does things without thinking. So initially, he might be defensive, saying he heard from someone that fanfiction has some magical properties when 'consumed'. But as Anko stares him down, he'll realize how silly it sounds. He might then turn into his more sincere self and say he was just curious and didn't really understand what fanfiction was. He would likely promise Anko not to do such a strange thing again and might even ask her to explain what fanfiction really is so he doesn't make the same mistake in the future.
She might be really confused. Fanfiction isn't something you can actually drink, so she'd probably think Naruto has lost his mind and scold him for doing something so strange.
Naruto might be a bit shocked at first, seeing the usually tough Anko in a vulnerable, drunk state. He would probably try to help her, like getting her some water or finding a place for her to rest.
Naruto would probably be extremely hurt at first. He values friendship and loyalty a great deal, so Anko's betrayal would be a huge blow. But he wouldn't give up. He'd likely try to talk to Anko to find out why she did it, hoping to change her mind.
If Naruto does figure it out, he could be really flattered. He might see Anko in a whole new light. But he would also be a bit confused because he has always seen her more as a senior or a friend. He would probably try to handle the situation gently, not wanting to hurt her feelings.
Maybe Anko would be shocked to find Naruto drunk. She could scold him for acting irresponsibly as a ninja. Or she might try to help him sober up and figure out why he got drunk in the first place.
Naruto would probably be very kind and protective. He knows what it's like to be alone as a child, so he'd do his best to make the child feel safe and loved.
Anko might initially be very angry. She has a prideful nature, so being humiliated by Naruto would make her want to lash out. She could challenge Naruto to a rematch immediately, vowing to make him pay for making her look bad.
I'm not sure exactly where you can find a specific 'Anko finds Naruto drunk' fanfiction. Fanfiction can be scattered across various platforms like FanFiction.net, Archive of Our Own (AO3), and Wattpad. You'd have to search using those keywords on these sites to see if there are any relevant stories.
Sakura might be initially shocked and a bit jealous, but she would probably come around to support Naruto as a friend. Kakashi would be more of a calm and collected figure, offering advice on how to handle the situation both as a ninja and as an expecting father. Sasuke, on the other hand, might be indifferent at first but later show some concern for Naruto's well - being in this new situation.
Naruto would probably be very curious. He'd want to know all about the bunnygirls, like where they come from and what their powers are. He might be a bit shocked at first, seeing as they're not like the people he's used to in the ninja world, but his adventurous spirit would quickly take over and he'd start making friends with them.