There might be. The Harry Potter fandom is quite large and diverse. Some fans might be interested in exploring the dynamic between Viktor and Hermione in a forced marriage situation. But it's important to note that not all fanfictions are well - written or adhere to the general spirit of the original series. You can search on major fanfiction websites to find out for sure.
One possible plotline could be that it's a political arrangement. Maybe in the wizarding world, there are political tensions between their respective countries, and a forced marriage is seen as a way to ease those tensions. Viktor and Hermione would then have to figure out how to live with each other while also dealing with their own personal feelings and the expectations of their countries.
One possible plotline could be the initial struggle between Viktor and Hermione. They might resist the marriage at first due to their different backgrounds and loyalties. For example, Hermione's loyalty to her friends in Hogwarts and Viktor's Quidditch career and his own cultural roots in Bulgaria.
One way to find such fanfics is to do a general web search using the exact phrase 'Viktor x Hermione forced marriage fanfic'. This might lead you to some blogs or personal websites that host or recommend these types of stories. But be cautious when exploring less - known websites as they might not be reliable or safe.
Hermione's friends would have a range of reactions. Ginny might be sympathetic towards Hermione, understanding the difficult position she's in. Neville could be worried about how this would affect Hermione's studies and her role in the fight against the dark forces. For Viktor's friends, they might try to encourage him to make the best of the situation. His Quidditch teammates might see it as an opportunity for Viktor to show his maturity and handle a complex situation. However, some of his closer friends might also be worried that he's getting involved in something that could end badly for him.
In some fanfiction, it could be due to a prophecy. A seer might have predicted that their union, though forced at first, would bring great things to the wizarding world. So, the wizarding authorities or some powerful wizards force them into an engagement. Hermione would be the one to try and find a logical solution, using her vast knowledge of magic and history. Viktor would use his physical strength and his own knowledge of different magical cultures to help. They might start off as reluctant partners but gradually develop a bond as they face various challenges together, like threats from dark wizards who don't want the prophecy to come true.
In fanfiction, if a marriage law were imposed on Hermione and Viktor, it could initially cause a great deal of turmoil. Viktor, being from Durmstrang, has a different cultural background. He might see the law as an opportunity to fully claim Hermione, whom he has long admired. However, Hermione, being a strong - willed and independent witch, would likely resist at first. She values her freedom and her own choices in matters of the heart. Their relationship could become a battle between Viktor's traditional values and Hermione's modern, liberal views.
In a fanfiction, Hermione and Viktor's baby could be the result of a magical accident. Maybe they were both working on a complex spell that went awry and somehow bound their magical essences together. This led to the unexpected pregnancy. Their friends from Hogwarts and Durmstrang are initially shocked but then become excited for them. The baby grows up to be a unique wizard with a blend of British and Bulgarian magical traditions.
One possible plot development is that Hermione and Viktor try to find a loophole in the marriage law. They might team up with their friends, like Harry and Hermione's Gryffindor pals, to research old magical laws and precedents. Another is that they could pretend to be in love to avoid the consequences of the law at first, but then actually fall for each other during the charade. Or perhaps Viktor's family in Durmstrang has some influence on the situation, either trying to push the marriage or prevent it depending on their own interests.
Well, some fans are intrigued by the idea of exploring an alternate relationship dynamic between Harry and Hermione. Since they are such close friends in the original series, the concept of a forced marriage takes that relationship to a whole new level and allows for different character arcs to be explored.