Well, the occurrence of a timeskip in a manga can be quite unpredictable. It usually happens when the author wants to introduce significant changes in the story or characters' situations. But without specifying the manga, it's impossible to give a precise answer.
External factors like long - distance might be an issue. If they have to be apart for work or other reasons, it can be tough on their relationship. They might miss each other a great deal and face difficulties in maintaining communication effectively.
One interesting aspect could be the way the fanfic writers develop the characters of Boru and Sara further. In a Borusara Lemon Fanfic, they might add more depth to their personalities and their interactions, especially in more emotional or romantic situations. Also, the exploration of their relationship in a different context, perhaps a more private or intimate one as hinted by 'lemon', can be quite fascinating for fans who are interested in this pairing.
Obviously, Borusara are the main characters. They are at the center of this fanfiction, and the story would likely focus on their experiences, emotions, and relationship during the pregnancy.
One interesting Borusara fanfic could be about their adventures in a new, unknown land. They might face challenges together and their relationship could deepen as they rely on each other.
I really like 'The Early Days of Hinata'. This fanfic shows Hinata's life before the time - skip. It includes her interactions with her family, especially her father, and how she starts to find her own strength. It's a heartwarming read that gives a lot of insight into her pre - timeskip self.
Sure, the Boruto timeskip has taken place in the manga. It marks a notable shift in the storyline, introducing new elements and evolving the characters' growth and relationships.