One possible reason could be a misunderstanding. Erza might misunderstand Naruto's intentions. For instance, if Naruto is on a mission that involves some secretive actions, Erza could misinterpret them as something malicious and decide to betray him.
Maybe in this fanfiction, there are some artifacts or powers that both Naruto and Erza are after. Erza betrays Naruto to get her hands on this power first. This could set off a chain of events where Naruto has to find a way to stop her from misusing the power. It could also make Naruto question his own judgment in trusting her in the first place.
Naruto would probably be extremely hurt. He is someone who values friendship and trust deeply. So, he might initially be in shock and disbelief. He would likely feel angry too, but his anger might be mixed with sadness.
Well, in fanfiction, the author might create this situation to explore new storylines. Maybe the author wants to show Naruto's vulnerability. Erza could be made to betray Naruto due to some misinformation or a dark influence. For example, if there's an evil force that manipulates Erza into believing Naruto is a threat to her world or friends.
Well, perhaps Erza was tricked into believing something false about Natsu. Maybe she was misled by some enemy who made it seem like Natsu was going to endanger the guild. So, in her sense of duty to protect the guild, she took actions that Natsu perceived as betrayal.
Perhaps Makarov, the guild master, could be a part of the story too. He might be the one who has to deal with the consequences of this betrayal within the guild. His wisdom and leadership would be put to the test as he tries to keep the guild together while Natsu and Erza are at odds.
It's possible that such a fanfiction exists. In the world of fanfiction, writers like to explore different relationships and plot twists. But it's important to note that Erza and Naruto are from different fictional universes. This kind of crossover with a cheating plot might be more of a niche or even a shock - value type of story. If it does exist, it may not be very popular among fans who prefer more positive and in - character stories for their favorite characters.
It's really hard to say. Naruto has his powerful ninjutsu like the Rasengan and can call on the power of the Nine - Tails. But Erza is no slouch either. She has a wide variety of armors with different abilities. If it's a long - distance fight, Naruto might have an advantage with his ranged attacks. However, if it gets up close, Erza could use her swords and combat skills to hold her own.
Maybe they could be rivals at first. Erza is highly competitive, and Naruto is always looking to prove himself. Their initial rivalry could turn into respect as they see each other's skills in combat. For example, Naruto might be impressed by Erza's ability to change armors and use different types of magic, while Erza could admire Naruto's never - give - up attitude and his powerful jutsu.
He could be betrayed by a false friend in the DxD world who spreads lies about him. For instance, telling others that Naruto has a hidden agenda to take over their realm.