It would strain their relationship. Sasuke's jealousy could make him act cold towards Naruto. He might avoid Naruto or be short - tempered when they interact.
One possible plotline could be that Sasuke sees Naruto with a powerful and unique sword. He becomes jealous because he feels Naruto is getting more attention or power because of it. So, he starts to train harder to prove he doesn't need a sword to be strong. Maybe he challenges Naruto to a sparring match to show that his own skills are superior without any fancy weapon.
Yes, there might be such fanfics out there. In the Naruto fandom, with a large number of fans creating various types of stories, it's possible that some would write a story where Naruto destroys Sasuke in a way that could be seen as Sasuke - bashing. However, these kinds of fanfics may not be in line with the overall spirit of the original work which focuses on their complex relationship and growth.
Let me recommend you a novel called "The Naruto World that begins with the drawing of a sword." The protagonist of this book is also Sasuke! He started off with a saber, and his strength depended entirely on slashing. Moreover, it was said that this saber had a very cool name, called "Decepticons"! As for 'Broken Teeth,' I really haven't seen any relevant information. I hope you like this fairy's recommendation. Muah ~😗
There could be Naruto. Since he and Sasuke have a strong connection in the original series, he might also be involved in the gamer fanfiction, maybe as a rival or teammate in the gaming world.
In this kind of fanfiction, Sasuke could die from a sneak attack. He might be so focused on his main target during the Wave mission that he doesn't notice another hidden threat. And this hidden enemy could strike him when he least expects it, leading to his death. For example, an assassin could be hired to specifically target Sasuke and use some sort of poison or a deadly jutsu that he can't defend against in time.
There could potentially be some really creative and out - of - the - box fanfictions with this concept. But finding one might be a challenge. You could try searching on specialized fanfiction websites and use specific search terms like 'Kakashi Sasuke non - traditional relationship fanfiction' and then look through the results to see if there are any that involve the idea of Sasuke being pregnant. But remember, this is a very unusual concept even for fanfiction.
Sasuke would probably be very guarded at first. He's not used to dealing with something so innocent and vulnerable. He might be suspicious of the baby's presence and think it's some sort of trap.
He might meet the future versions of Naruto and Sakura. Their relationship with him could be very different in the future, perhaps they are now leaders of the village and Sasuke has to adjust to their new status.
Sasuke would be furious. He's always been protective of Naruto in his own way. He would immediately start looking for her, using all his skills and resources. He might even go on a rampage if he thought Naruto was in serious danger.