One possible plot could be a story where Naruto and Kushina grow up together in a different timeline. They could face the challenges of the ninja world side by side. Maybe they'd train together under Minato and form a unique bond that's different from the usual mother - son relationship. This could lead to them having adventures and making friends together, and their combined skills might change the course of some of the events in the Naruto universe.
If Naruto and Kushina were the same age, Naruto might develop more of an empathetic side earlier. Since Kushina was known for her strong will and compassion, being around her could make Naruto more in tune with his emotions. He might not be as reckless as he was in the original story because he'd have Kushina to balance him out.
One possible plot could be that since they are the same age, they grow up as friends and training partners. They face the challenges in the ninja world together from a very young age. Naruto, with his positive attitude, and Kushina, with her strong will, might end up changing the fate of the Hidden Leaf in a different way compared to the original story.
In this fanfiction scenario, Minato would not have the same kind of paternal - like relationship with Naruto. Instead, they could be rivals in love for Kushina's affection. Minato would also have to prove himself not just to Kushina but also to Naruto. Their relationships would be a web of competition, friendship and budding romances. It would be a completely different story from the original, with different power dynamics and emotional entanglements among the three characters.
Well, I'm not entirely sure about a specific lemon fanfiction involving Menma and Kushina. However, in general, if it's a fanfiction, it might explore alternate relationships or scenarios within the Naruto universe. It could potentially show how Menma's relationship with Kushina might develop in a different way compared to the original story.
In the context of the official Naruto series, it's completely inappropriate because there is no such aspect in the original story and lemon fanfiction often contains improper content. Also, Kushina's character is defined by her love for her family and the village, not this kind of fictional and inappropriate obsession.
I'm not sure exactly which 'lemon fanfiction' you're referring to. But if it involves Naruto, Kushina, and Tsunade, it might explore their relationships in non - canonical ways. Maybe it could show Kushina's influence on Naruto's life through some creative scenarios, and Tsunade's role as a mentor or a more complex relationship figure.
I'm not sure there is an official 'Sister Lemon' in the Naruto canon. But in a fanfiction, perhaps this 'Sister Lemon' could be an original character. Maybe she could be a long - lost sister who has some unique powers related to the Uzumaki clan, like Kushina. She could play a role in Naruto's growth and his understanding of his family's past.
It's difficult to determine the popularity of this particular fanfiction. There are so many fanfictions out there in the Naruto fandom. If it has a unique and engaging story, it might be popular among those who are into darker interpretations of the Naruto characters and stories. However, it could also be relatively unknown if it hasn't been promoted well or if the theme is too niche for most fans.
I'm sorry, but the idea of such a fanfiction title contains inappropriate and disrespectful content towards the characters. Naruto and Kushina have a very important and positive relationship in the Naruto series, and this kind of title goes against the essence of their characters.