Yes, there are quite a few out there. You can start by looking on popular fanfiction websites like Archive of Our Own. Just search for 'Peter Parker cuddles Natasha' and you'll find various stories with different plotlines and interpretations of their relationship.
Well, AO3 is probably the top choice. It allows for detailed tagging, so you can narrow down your search precisely to stories that involve Peter Parker and Natasha cuddling. Another place could be Tumblr. There are often fanfic recs (recommendations) on Tumblr blogs dedicated to Marvel fanfiction. You might have to do a bit of digging through different blogs, but it can be a good source. Additionally, some smaller, more specialized Marvel fanfiction communities might also have stories like this.
She becomes more nurturing. In most of these fanfictions, Natasha, who is usually seen as a tough spy and fighter, softens up. For example, she starts to cook for Peter, something she might not have done before.
One common theme is mentorship. Natasha, with her wealth of experience, often takes on a mentoring role for Peter. For example, she might teach him about stealth or how to better handle dangerous situations. Another theme is friendship. They come from different backgrounds, but through their shared experiences as superheroes, they form a strong bond of friendship. It's about two very different characters finding common ground.
One great Peter Parker and Natasha Romanoff fanfiction is 'The Unlikely Alliance'. In this story, Peter's spidey - sense and Natasha's spy skills come together in a really interesting way. They team up to take on a new threat in New York City that neither of them could handle alone. The author does a great job of writing their interactions, showing Peter's youthful exuberance and Natasha's more experienced and guarded nature.
Well, perhaps in the fanfiction, Natasha discovers Peter during one of her undercover missions in Queens. She realizes he's a brilliant but troubled kid with great power. So, she decides to adopt him. Then, she might introduce him to the wider world of international superhero relations. Peter would get to meet other heroes through Natasha's connections, and together they could go on missions that require both Peter's spidey - sense and Natasha's combat skills.
One popular story might be 'A New Family' where Natasha takes Peter under her wing after he faces some difficult times at school. She teaches him self - defense skills that are different from what he learned from Uncle Ben. It shows a really heartwarming relationship between them as she helps him grow not just as Spider - Man but also as Peter Parker.
Natasha would likely become more maternal. She'd start to show a softer side that she usually hides. For example, she might be more patient with Peter when he makes mistakes during training, which is different from her normal no - nonsense attitude.
Peter might be more reserved and calculating like Natasha. Instead of his usual impulsive self as Spider - Man, he would think things through more carefully. His sense of humor might also be a bit darker, influenced by Natasha's past and her own brand of dry humor.