What if Sasha Braus gets pregnant prevented the Rumbling?

After Shiganshina has been retaken and the Warriors have been driven away, the Scouts Regiment have discovered the truth from Grisha's books in the basement of the destroyed Jaeger's household. From those books, they have learned that they are living on an island called Paradis Island and the nearby nation on the mainland, Marley, hates them for what their ancestors had done to their ancestors centuries ago and is intending on committing genocide against the island's inhabitants in order to obtain the Founding Titan and the island's resources that are the iceburst stones.

But the most important and the most terrifying of them all, they learned that the three Walls that have been protecting them from the Titans that had been infesting the island are made up of millions of Colossal Titans!

With such discovery made public, the population inside the Walls is divided into many opinions. As this is happening, a ceremony is held. And during the ceremony, Eren kissed the hand of Historia, the new Queen of Eldia. And by doing so, he witnessed fragments of the future, which told him that the Rumbling is now on the way.

And as much as Eren wanted to wipe out Marley and everything beyond Paradis Island away with the Rumbling to protect his loved ones and to also achieve his personal goal of seeing the world according to Armin's book, he also knows that it is wrong to do so!

So what can be use as an alternative? What can be done?

Then, he suddenly remembered one thing. He saw the **** of Sasha Braus, one of his dear friends, by a gunshot in the aftermath of the attack at the Marleyan city across the sea. That is when he had an idea! If she did not die, the Rumbling might be prevented! But how can he do that? The answer is simple. She needed to get pregnant so that she won't be able to participate in this attack.