One idea could be a crossover where Naruto and his friends end up in the world of Yuno Gasai. Naruto's positive attitude might clash with Yuno's extreme possessiveness at first. But as they face challenges together, they learn from each other. For example, Naruto could teach Yuno about the power of friendship and believing in others, while Yuno could show Naruto how to be more strategic in a different kind of dangerous world.
There's also 'Yuno's Heart'. In this fanfic, the author does an excellent job of exploring Yuno's complex personality while developing a sweet and somewhat suspenseful relationship with the reader. It's full of emotional moments and unexpected twists.
One common theme is the clash of personalities. Yuno has a very distinct and intense personality, so when she's crossed over into other worlds, like in a crossover with Sword Art Online, her personality clashes with the more laid - back or heroic characters there. Another theme is the adaptation to new rules. For example, if she's in a world like Fullmetal Alchemist, she has to deal with the laws of alchemy which are very different from her own world.
Naruto would likely be very friendly towards Yuno at first. He's used to befriending all kinds of people. Yuno, on the other hand, might be a bit guarded. But Naruto's sunny personality could gradually break down her walls. For instance, he might share his ramen with her, which is his favorite food, and in return, Yuno could show him some of the things she likes in her world.
The relationship development between Yuno and the reader is key. It should be believable and engaging. This could involve showing how they interact in different situations, like in school or during dangerous events. It can't be rushed; a slow - burn can often work really well.
One interesting Yuno Gasai lemon fanfiction could be one where Yuno and the main character go on a picnic in a secret garden. It might focus on their emotional connection during this simple yet intimate moment, with some light romantic and fluffy elements rather than just the 'lemon' aspect. This type of story can show a different side of their relationship.
She might become more protective. Yuno was already possessive, but with a pregnancy, that could be magnified. She'd want to safeguard not only her partner but also the unborn child.
One great Yuno Gasai crossover fanfiction is 'Yuno in the World of Death Note'. It's interesting to see how her extreme personality would interact with the complex world of Death Note. Another one could be 'Yuno Gasai Meets the Attack on Titan Crew'. It creates a whole new dynamic as she tries to survive in that post - apocalyptic world with Titans.
You can try some well - known fanfiction websites like Archive of Our Own (AO3). It has a large collection of various fanfictions, including those related to Yuno Gasai. Just be sure to check the tags and ratings to find the ones that suit your taste.
A plotline could involve Yuno Gasai hiding her pregnancy from those who might oppose it or use it against her. She could be in a situation where she has to keep it a secret to ensure her own safety and the safety of the unborn child. This could lead to a lot of internal conflict and tense situations.