Yes, there are likely fanfictions out there with such a plot. Fanfiction writers often explore various 'what - if' scenarios, and a Grimmjow and Orihime pregnancy could be an interesting concept for many. However, the quality and nature of these fanfictions can vary greatly.
Well, in a Grimmjow and Orihime pregnancy fanfiction, it might start with an unexpected encounter that leads to their relationship developing in a romantic way. Orihime's powers could play an interesting role during the pregnancy, perhaps helping to keep the baby safe. Grimmjow, on the other hand, would probably be very protective in his own rough way. The story could also explore how they deal with the cultural differences in the 'Bleach' world, as Grimmjow is from Hueco Mundo and Orihime is from the human world.
Their relationship would likely become more intimate in a different way. There would be a deeper level of trust and reliance. Ichigo would see Orihime in a new light, as the mother of his child.
Some possible titles could be 'Female Ichigo's Encounter with Grimmjow', 'The Bond Between Female Ichigo and Grimmjow', 'Female Ichigo and Grimmjow: An Unlikely Pair'.
I'm not sure about a specific 'Ichigo and Orihime lemon fanfiction' title off - hand. But you can often find great ones on fanfiction websites. Just search for 'Ichigo Orihime relationship fanfiction' and look through the results. You might have to sift through a bit to find the ones that are well - written and suit your taste.
In the fanfiction, perhaps they are forced to team up due to a common enemy. As they spend time together, they realize they have more in common than they thought. Female Ichigo might be intrigued by Grimmjow's wild nature, and Grimmjow could be attracted to her strength. They could end up having deep conversations about their pasts and their places in the world, and this could lead to a strong emotional bond between them.
I'm not sure if there is a specific fanfiction with such a storyline. Fanfiction can cover a wide range of themes and ideas, but this particular one might be quite rare or not widely known. You could try searching on specialized fanfiction websites.
Yes, there are many. You can find them on various fanfiction platforms. These works usually focus on Orihime's friendships, her growth as a character, and her adventures within the world of the original story.
Many fanfics focus on the development of their love. Some might start from the early days when they were just friends in the story. They gradually realize their feelings for each other through various adventures and challenges, which makes the love story more engaging and full of twists.