Well, it could start with Loki sacrificing himself for Thor in some way, and as a result, he turns into a star. Thor would then be left with a deep sense of loss and longing. He might see the star as a symbol of Loki and constantly look up at it, reminiscing about their time together.
You can try searching on popular fanfic platforms like Archive of Our Own (AO3). Just use the keywords 'Loki turns into a star Thorki' in the search bar, and it should show you relevant stories if there are any.
The transformation of Loki into a star would shatter Thor's world. Thor has always had Loki in his life, whether as an adversary or an ally. This new form of Loki would be a constant reminder of what he has lost. Thor may become more isolated, feeling that no one truly understands his pain. He might also become more reckless in his fight against the enemies, as he has less to lose now that Loki is gone in such a strange and permanent way.
I'm not sure about the exact title, but there are some fanfics where Loki turns into a star as a form of self - sacrifice. In these stories, Loki makes the ultimate sacrifice to save his realm or the people he cares about. It's a very poignant concept and makes for some really engaging reading.
One possible theme could be transformation. Loki going from a physical being to a star represents a huge change, not just physically but also in terms of his existence and how he is perceived. It could also be a theme of self - discovery. As he becomes a star, he may learn new things about himself and his place in the universe.
The star could symbolize Loki's ultimate freedom. Throughout his life, he was trapped by his own desires, by the expectations of others, and by his family dynamics. As a star, he is free from all that. It also might be a symbol of Loki's connection to the cosmos on a deeper level. He was always a bit otherworldly, and this transformation cements his place in the grand scheme of the universe. For Thor, the star could be a reminder of the enigma that was Loki, and that there was always more to his brother than met the eye.
One common theme could be the relationship dynamic between Thor and Loki in this new situation. It might explore how Thor reacts to Loki being pregnant.
Honestly, I don't have a particular 'thorki pregnant loki fanfiction' at hand to recommend. However, when you start looking, consider the writing style, the way the characters are portrayed, and how the plot develops. Fanfiction can vary greatly in quality, so it's important to be a bit discerning. You could also join fanfiction communities or forums where fans discuss their favorite stories. They might be able to point you in the right direction.
One popular 'thorki fanfic' is 'The Golden Age' which delves deep into the relationship between Thor and Loki in an alternate universe. It has a great plot that focuses on their complex bond and how they navigate through various challenges together.
You can start by searching on popular fanfic websites like Archive of Our Own. Just type in 'thorki fanfic' in the search bar and you'll get a whole list of stories. You can then sort them by popularity or rating to find the good ones.