Well, it could be about Harry and Hermione taking on the role of raising Teddy Lupin. Maybe it shows how they handle his upbringing, deal with his magical education, and support him through various challenges in the wizarding world.
In this fanfiction, perhaps it focuses on the relationship dynamics between Harry, Hermione, and Teddy. It might depict how they form a family - like unit. Harry could bring his own experiences of growing up an orphan, and Hermione her intelligence and resourcefulness to Teddy's life. They might face difficulties from the wizarding community as well, since it's an unusual situation for them to be raising Teddy together.
The 'harry and hermione raises teddy fanfiction' might explore different aspects of their lives while raising Teddy. For example, it could show how they introduce Teddy to different magical creatures and places. It may also touch on the emotional bonds they develop. Harry, having lost so many people close to him, might be very protective. Hermione, on the other hand, would be keen on teaching Teddy everything she knows. And Teddy, growing up with them, would have a unique perspective on life in the wizarding world.