Perhaps a story where Black Widow accidentally stumbles into the wizarding world and is mistaken for a threat at first. But then she proves herself useful in helping to solve a mystery within Hogwarts, like a series of strange disappearances that are actually related to a dark plot. This would be a story full of mystery, adventure, and no 'lemon' content.
A plotline could involve Black Canary being a mysterious figure who appears in the Forbidden Forest. Harry and his friends are initially suspicious but soon realize she has powers and knowledge that can help them. In terms of the 'lemon' element, it could be that Black Canary has a past connection to a character's family. For example, she was once in love with a wizard from an old family in the Harry Potter world. This connection resurfaces and causes a stir in the wizarding community, while they also have to deal with threats from Voldemort's remaining followers who are intrigued by this new arrival.
One possible plotline could be that Black Widow somehow gets transported to the Naruto universe. She could use her combat skills and spy training to help the ninja in Naruto's world with a particular mission, like dealing with a new and dangerous enemy that has techniques similar to those in the Marvel world. For example, an enemy that can control minds like some villains in the Marvel universe.
Yes, there are likely many. You can start by looking on popular fanfiction websites like Fanfiction.net or Archive of Our Own. On these platforms, you can filter out the inappropriate content and search specifically for crossovers between 'Harry Potter' and 'Black Widow' that focus on adventure, friendship, or other non - 'lemon' themes.
There could be a plot where Futa Hermione becomes a key figure in the fight against dark magic. She might develop a new form of defensive magic that is based on her own characteristics. Also, her relationships with other characters could be explored in a non - romantic, but deep and meaningful way. For instance, her mentorship of younger students, or her cooperation with other Hogwarts professors to improve the curriculum to be more inclusive of different magical beings and identities.
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.
One possible plotline could be that Winky Lemon, if she has some unique magical abilities, helps Harry in a difficult situation at Hogwarts. Maybe she has a special connection to a part of the castle or a magical creature that is crucial to solving a mystery.
A plotline could involve the demonness being an outcast in her own world and finding a new home in the wizarding world of Harry Potter. Harry, being the empathetic hero, helps her adjust. They team up to solve a mystery that is related to both their worlds, like a magical object that has the power to either destroy or save both the demon realm and the wizarding realm. It's a story of acceptance and cooperation.
One possible plotline could be that Black Widow gets pregnant through some sort of scientific experiment gone wrong. But instead of it being something dark, it becomes a journey of self - discovery. She could start to see the world in a different light, with more hope for the future, and the other Avengers could help her come to terms with this new situation.
One possible plotline could be that Harry discovers he has a hidden connection to the Black family that makes him Lord Black. This could lead to him having new powers or responsibilities within the wizarding world, and he might have to deal with the complex politics and family secrets of the Blacks.
Perhaps the Black family member is in danger, and the betrothal is a way to protect her. Harry gets involved in the Black family's secrets and power struggles while trying to uphold the betrothal. Another plot could be that it was a magical accident or a prophecy that led to the betrothal, and they have to figure out how to deal with it.