The plot could be centered around Shira adjusting to her pregnancy. She may find it difficult to keep up with the group's travels at first. Diego would be by her side, constantly worried. Sid might try to cheer her up with his goofy antics.
Well, the plot could start with Shira realizing she's pregnant. As the story unfolds, we could see her relationship with Diego grow even stronger as they prepare for parenthood. Meanwhile, the rest of the gang could be on a mission to find a magical place where Shira can give birth safely. Along the way, they encounter different obstacles like dangerous terrains and unfriendly animals, but they overcome them all for the sake of Shira and the baby.
Maybe the fanfiction could focus on how their relationship changes during the pregnancy. Diego becomes more tender and loving, and Shira becomes more dependent on him in some ways. They could also have some arguments about how to raise the cub. For instance, Diego might want to teach the cub to be a fierce hunter from the start, while Shira thinks it should first learn to be gentle and kind. These differences in opinion add some spice to the story while they are waiting for the new life to arrive.
The plot could be centered around Shira trying to keep up with the group's adventures while being pregnant. For example, when they are on the run from the various disasters in the movie, she has to be more careful. But her pregnancy also gives the group a new sense of purpose - to protect her and the unborn baby.
There's also the possibility that it could be an unknown character that isn't even a saber - toothed tiger. In the Ice Age world, there could be some magical or special circumstances that led to Shira's pregnancy. For example, she could have been under the influence of some ancient Ice Age magic that made her pregnant, and the father could be a mystery related to that magic.
One possible plot idea could be that Shira discovers she's pregnant and she and her partner (maybe Diego) have to prepare for the new arrival. They might face challenges like finding a safe place in the ice - age world. Another idea could be that the other animals in the group initially don't know how to react but then come together to support her.
One possibility could be that the story focuses on how Diego and Shira prepare for the arrival of their baby. They might face challenges like finding a safe place in the ice age world, gathering enough food, and protecting their future cub from other predators. Maybe they'll get help from their friends, like Manny and Sid.
Perhaps in this fanfiction, Shira discovers she's pregnant quite unexpectedly. She initially panics as she doesn't feel fully prepared. However, Diego is overjoyed and promises to be by her side. The other animals in the group are also excited and start preparing for the new arrival. They gather soft furs for a baby bed and look for special foods that are good for Shira during her pregnancy.
One possible fanfiction idea could be that Shira's pregnancy brings out a more protective side in Diego. He starts to gather extra food and find a safer place for them to stay. The other characters, like Sid, might initially be a bit clumsy in helping but mean well.
One possible plot could be that Diego and Shira go on a journey to find a new place for their pack to settle. Along the way, they face various challenges like crossing a dangerous river and avoiding a group of hunters. They have to rely on each other's skills, with Diego's strength and Shira's agility. Their relationship deepens as they overcome these obstacles, and they end up leading their pack to a beautiful and safe new territory.
In a fanfiction, their love might start with a misunderstanding. Diego mistakes Shira for an enemy at first sight. But as he gets closer to her, he realizes she's just a misunderstood creature. Shira, in turn, is initially wary of Diego. However, as they are both caught in a dangerous situation, like being trapped in a cave during an earthquake. They have to rely on each other to survive. This experience makes them see each other in a new light and their love begins to blossom.