One idea could be that they are forced to team up to fight a common enemy, like a powerful demon threatening their respective territories. As they fight side by side, they gradually develop a mutual respect for each other's skills.
One idea could be that they get transported to a magical realm where they have to solve a series of puzzles to return home. Along the way, they learn more about each other's strengths and weaknesses. For instance, Inuyasha's impulsiveness might get them into trouble at times, while Sesshomaru's calmness helps them get out of it.
They could start with a rivalry. Sesshomaru might look down on Koga as a less powerful being, but as Koga proves his worth in battles and shows his loyalty to his pack, Sesshomaru's view slowly changes.
Well, a possible plot for Koga x Inuyasha mpreg fanfiction is that a mysterious artifact they come across has some sort of fertility - enhancing magic. Inuyasha accidentally activates it and becomes pregnant. Koga is confused but also excited. They then have to find a way to keep Inuyasha safe during the pregnancy. Maybe they seek help from a wise old priestess who is hesitant to get involved at first. Or perhaps they face a rival who wants to harm Inuyasha because of this unique situation, thinking it will make Koga weak.
A plot could revolve around Sesshomaru being intrigued by Naruto's determination. Sesshomaru decides to train Naruto in some of his own combat techniques, which Naruto adapts to his own fighting style. In return, Naruto shows Sesshomaru the value of friendship and loyalty within a village. This could lead to Sesshomaru having a change of heart about his own solitary ways. Also, they could team up to face a common foe from Sesshomaru's world that has somehow entered the Naruto universe.
Another plot could be that Kagome gets lost in a dangerous part of the spirit world and Sesshomaru, who happens to be there, reluctantly decides to help her find her way back. As they journey through the spirit world, they encounter various challenges that force them to rely on each other. Kagome might use her spiritual powers in new ways, and Sesshomaru could show a more protective side.
One plot idea could be that Nami and Robin team up to solve a mystery on an uncharted island. Nami uses her navigation skills to get them there, and Robin uses her knowledge of ancient texts to decipher the clues. Along the way, they have deep conversations about their dreams and fears, strengthening their friendship.
One idea could be that Haku survives and joins Naruto on his journey to become Hokage. They could travel together, with Haku using his ice jutsu to help Naruto in various battles and Naruto teaching Haku about the power of friendship and never giving up. This would be a story of their growth as comrades.
They could be on a diplomatic mission together to another village. Along the way, they face various challenges like cultural differences and distrust from the other village. Through their combined efforts, they manage to overcome these obstacles and in the process, their relationship as comrades grows. This kind of plot can show their diplomatic and problem - solving skills while also exploring their relationship.
One idea could be that Kagome brings chocolate from her time as a gift for Sesshomaru. He is initially suspicious but then becomes intrigued by the unique taste. Another could be a story where chocolate has some sort of magical property in their world, and Sesshomaru and Kagome have to work together to control its power while also dealing with their growing feelings for each other.
A plot idea could be that Kagome's pregnancy gives her new powers or a stronger connection to the spiritual world. This could attract the attention of evil forces who want to use her unborn child for their own gain. Koga has to fight off these threats while also taking care of Kagome during her pregnancy. Another idea is that they go on a journey to find a special place or item that is said to ensure a safe delivery for their baby. This journey could be filled with challenges and revelations about their relationship.