There could potentially be some 'Black Widow Hulk' fanfic with what might be considered 'lemon' aspects out there in the vast expanse of the internet. However, such content might be difficult to find as it may not be promoted on major fanfic platforms due to content policies. Major platforms usually focus on more family - friendly or at least non - explicit content. So, if it exists, it's likely in some of the more niche or less - regulated corners of the fanfic world.
A theme of friendship or mutual respect might be explored. Despite their differences, they could come to understand and rely on each other. For example, Hulk might initially be difficult to control, but Black Widow could find a way to communicate with him and they form a bond. This could be developed in a story set in the Avengers' compound where they have to live and train together.
A 'black widow lemon fanfic' is likely a fan - created fictional work related to the character Black Widow. 'Lemon' in fanfic terms often implies a story with romantic or sexual undertones, but it could also just be a creative and unique take on the character in a more general sense.
In the comics, their relationship can be described as complex and not always straightforward. Sometimes they work together on missions, and there are moments of mutual support and understanding.
The Hulk and Black Widow love story was cut perhaps because of their individual character development. Hulk's story is mainly about his internal battle with the Hulk persona. A love story would have diverted from that main theme. For Black Widow, she was involved in other aspects like her past and her role in the Avengers. Also, from a cinematic point of view, it might not have fit well with the action - packed and complex narrative that Marvel was building. They needed to focus on other relationships and storylines that were more central to the overall Marvel universe.
Sure, there are pieces of fanfiction focusing on a Hulk - Black Widow romance. In these stories, the writers usually play with the idea of the contrast between the Hulk's brute strength and Black Widow's agility and intelligence. It could be a story where the Hulk protects Black Widow in a new and unexpected way, leading to feelings developing between them. They might also explore how their different backgrounds in the Marvel universe could bring an interesting dynamic to a romantic relationship.
Another theme is the power of friendship. They come from very different backgrounds, but in fanfiction, they often form a strong bond. They support each other in battles and in personal growth. Like when Black Widow is in a tough situation and the Hulk comes to her rescue, showing that they have each other's backs.
Another theme is redemption. Sometimes the Hulk is portrayed as a character seeking redemption for the destruction he's caused, and Black Widow helps him on that journey. It's about how they can find a new purpose together. A lot of fanfictions also play with the idea of them being outsiders in the Avengers group, and how they form a special bond because of that.