Maybe a dark force takes over Naruto's mind. This force could be an ancient evil that has been sealed away for centuries and now wants to create chaos in the ninja world. It uses Naruto as a puppet to kill Tsunade, one of the most powerful protectors of the village. The story could then focus on Naruto's friends trying to free him from this control and avenge Tsunade.
It's not a very common theme. Naruto is usually depicted as a hero who respects and protects his comrades, and Tsunade is an important figure in the Naruto universe. However, some fanfiction might explore such a dark theme to create an alternate universe or a shock factor. Maybe the author wants to explore how Naruto could be corrupted or misdirected in a different storyline.
If Tsunade kisses Naruto, it could strengthen their relationship in a mentor - like way. Naruto might see it as a sign of deep respect and trust from Tsunade. He would likely feel more confident in following her guidance. For Tsunade, it could be a way of showing her pride in Naruto's growth.
One possible reason could be a misunderstanding. Maybe Tsunade received some false information about Naruto that made her think he was a threat to the village, so she took actions that ended up hurting him.
Naruto might be initially confused. He trusts Tsunade, so being kidnapped by her would be completely unexpected. He would probably start by asking her why she's doing this.
One great 'Naruto and Tsunade Fanfiction' is 'The Mentor and the Student'. It explores Tsunade's role in Naruto's growth further. It shows how she not only teaches him medical ninjutsu but also imparts wisdom about leadership. Another one could be 'A Different Bond' which delves into their relationship in a more emotional way, showing how they support each other through tough times in the village. There's also 'Naruto and Tsunade: The Unseen Alliance' which creates unique adventures for them that are not part of the original storyline.
One possible way Naruto could anger Tsunade in fanfiction is by putting himself in unnecessary danger. Tsunade cares about the safety of her villagers, especially someone as important as Naruto. His disregard for his own well - being might make her furious.
In many fanfictions, Naruto's determination and positive attitude start to rub off on Tsunade. She has been through a lot and is a bit jaded, but Naruto's energy makes her feel alive again. This new - found connection leads to a budding romantic relationship. For example, Naruto might bring her small gifts from his travels, which are simple but meaningful gestures that slowly warm Tsunade's heart.
It could be due to the current situation in the village. There might be threats that required Naruto to stay. Tsunade, as the Hokage, had to consider the overall safety and stability of the village. So, she denied Naruto's request for the training trip to ensure he was available in case of any emergency.
I'm not entirely sure if there is a specific 'Naruto sleeps with Tsunade' fanfiction. Fanfiction can cover a wide range of themes and ideas, some of which might be quite strange or far - fetched. However, if it exists, it could be a product of someone's wild imagination, perhaps exploring a romantic or platonic relationship between the two in a very different context than the original anime or manga.