A third group of fans might simply ignore it. They are so set on the original story and the positive portrayal of Sasuke and Sakura's relationship that they don't want to engage with any fanfic that goes against that. They might consider it a disrespect to the original creators' intentions for the characters.
Sakura might be heartbroken at first. She has always been in love with Sasuke and to find out he's cheating would shatter her world. She could become withdrawn and focus more on her medical ninjutsu as a way to cope.
On the other hand, some fans might be interested in seeing a different and more complex side of the characters. They could view it as an exploration of what could happen if the characters were faced with different challenges and temptations. However, there would likely be a lot of debate among fans, with some firmly against it and others more open - minded.
Some fans might be very shocked and disappointed. Sonic and Amy have a long - established relationship in the Sonic franchise, and this would be a huge deviation from what they expect.
Some fans might be really shocked and disappointed. Since Rias and Issei are a popular couple, this would go against the expected relationship dynamic. They might feel that it ruins the 'canon' in a way. Others might be intrigued. They could see it as an interesting 'what - if' scenario and be curious to see how the author develops the story from such a controversial starting point.
Sakura would probably be initially very angry. She has strong feelings for Sasuke, but kidnapping is a very extreme act. So she would likely fight back, using her medical ninjutsu skills and combat abilities to try and escape.
Naruto's reaction would be complex. He would be devastated because his bond with Sasuke is so deep. However, he also trusts Sasuke to an extent. So, he would be torn between his immediate emotional response of anger and his long - standing faith in Sasuke. He might start to look for clues and evidence, and in the process, he could end up uncovering Kabuto's devious plan while also reaffirming his friendship with Sasuke. He would probably be more determined than ever to set things right and prove Sasuke's innocence if he is indeed innocent.
Well, a number of fans are divided. Some feel that the insults are a form of character assassination for Sasuke, as they view him as a more complex and redeemable character than one who would just randomly insult Sakura. Others, though, might see it as a way to explore the darker side of their relationship and how Sakura can grow from being insulted and become an even stronger character.
On the other hand, there could be fans who are interested in seeing the drama and conflict that would come from this. They might enjoy seeing how the characters would deal with such a complex and emotional situation. It could also open up new ways of exploring the personalities of Percy and Artemis.
On the other hand, some fans might be interested in seeing how the author develops the story from such a controversial starting point. They could be curious about how Pepper will respond and if there's a chance for redemption for Tony.
He could initially be in disbelief. However, as the reality sinks in, Sasuke would start to show his softer side. He might be more attentive to Sakura's needs, like making sure she eats well and rests. He would also start thinking about how to train their child to be a strong ninja in the future, while also wanting to give the child a more peaceful life than he had.