One interesting fanfiction could be about Randyll Tarly's early life and how he was trained as a warrior. It might explore his relationship with his family members before the events in the show or books.
In a Danny Phantom fanfiction where Sam gets hurt, Danny might go into a rage. He'd use his ghost powers to find out who was responsible and protect her at all costs. Maybe he'd have to face a new, more powerful ghost that targeted Sam because of her connection to Danny.
Sam Davis' capture was a turning point in his life. He was a brave individual who faced the situation with courage, but the details of his experience during capture are quite complex and involved.
Samwell Tarly could be a great character to pair with Randyll. Their father - son relationship is complex and full of conflict. A fanfiction could explore how they might reconcile or further their differences in an alternate scenario.
I think Sam Moskowitz's review on how science fiction got its name was comprehensive. It likely included analysis of early works, reader reception, and the changing landscape of the genre over time.
In fanfics, all kinds of scenarios are possible. Just because it's written doesn't mean it adheres to the original canon. Maybe the author wanted to explore a unique relationship dynamic through this pregnancy plot. However, without reading it, it's hard to say more about it.
I don't know who Sam is without reading the 'kings fund sam's story'. Sam could be a patient, a researcher, a staff member or someone else related to the Kings Fund.
Sam could be just an ordinary guy who loves exploring the woods. He might be a nature enthusiast who spends his free time in the forest, and one day he just happens to come across Bella.