Another theme is the exploration of their relationship. It could be a friendship that develops into something more, or a complex relationship where they have to overcome differences in their beliefs and values. For example, Geralt's more solitary and sometimes cynical view compared to Saskia's more idealistic stance. In many fanfictions, this contrast is what makes their relationship so interesting to explore. They might also face external threats that test their bond, like powerful enemies or political intrigue in the world they inhabit.
I'm not sure specifically which Danielle Lindemann you're referring to. There could be many people with that name. If she is a public figure in a particular field like an author or a scientist, more context would be needed to tell her true story.
Rather than seeking lemon fanfiction, which might not be suitable or in line with all audiences, you could look for general Geralt and Saskia fanfiction. There are many stories that focus on their relationship, adventures together, and the development of their characters in a more family - friendly way. You can start by checking out popular fanfiction websites and filtering by their relationship tag.
One possible aspect could be her educational journey. Maybe she had to overcome difficulties in school or had a particularly inspiring educational experience that shaped who she is.
The Overlow manga and anime have their distinctions. The anime might change the order of events or give more emphasis to action scenes. But generally, they both offer an enjoyable experience related to the original story.