One common theme is family. Since they are sisters, many fanfictions explore their complex family relationship, like how they reconcile their past in the Red Room. Another theme is loyalty. They are often shown being extremely loyal to each other, standing by one another through tough times. And of course, the theme of sisterhood is everywhere. They support, protect, and sometimes even bicker like real sisters in the fanfictions.
Thor could also be in the mix. His god - like powers and different cultural background compared to Yelena would create an interesting dynamic. Maybe Yelena is initially in awe of his abilities or she challenges him in some way, leading to an engaging interaction.
Sure. One popular Yelena and Natasha fanfiction is 'Sisterly Bonds'. It beautifully explores their relationship, showing how they support and protect each other. Another great one is 'The Red Room Reunion' which delves into their past in the Red Room and how they deal with the memories in the present. There's also 'Yelena's Perspective' that gives a unique view of Natasha from Yelena's point of view.
Well, Steve Rogers might be a bit confused at first. He's from a different era and fanfiction is a very modern concept. But he'd probably be polite about it and say something like 'It's interesting to see how fans imagine different scenarios with Yelena.' Tony Stark, on the other hand, would likely be more intrigued. He might chuckle and say 'This is some creative stuff. I wonder what else they come up with about Yelena.' And Thor would probably just be like 'This is a strange Midgardian thing, but if it makes people happy, then so be it.'
Tony could use his technology to analyze the popularity trends in Yelena fanfiction. He might say 'I can see which scenarios are the most popular in these fanfics about Yelena.' Natasha might take some of the positive portrayals in the fanfiction as a compliment to her sister. She could say 'This shows that Yelena is making an impact.' Thor might not fully understand but he could share the fanfiction stories in Asgard as a strange but interesting Midgardian thing.
Yelena could bring a fresh perspective to the Avengers. Her skills as a Black Widow would be something they notice right away. She might start off being a bit stand - offish, but as she sees the Avengers' good intentions, she warms up. They could exchange combat techniques and strategies. And she might even teach them some of the more underhanded tactics she learned during her training.