One possible plotline could be that Rey finally succumbs to the dark side under Kylo Ren's influence. He might train her in the ways of the dark side, leading them to rule the galaxy together with an iron fist. Maybe they start by taking over the First Order and using its resources to spread fear and chaos.
A possible plot could involve Rey being lured to the dark side by Kylo Ren as a way to save him. She might think that by joining him in the darkness, she can somehow redeem him. But once she steps into the dark side, she realizes it's not as easy as she thought. They then embark on a journey that challenges their beliefs and their connection to the Force, all while being on the wrong side of the moral spectrum.
Kylo Ren might become more confident and powerful as he has Rey by his side in the dark side. He could see her as his equal and together they could develop a more complex relationship that is based on mutual understanding of the dark side's allure.
One possible plotline could be that Rey discovers she is pregnant and struggles with how to tell Kylo Ren. She might be worried about his reaction given their complex relationship. Another could be that Kylo Ren finds out first and then has to decide whether to support Rey or if his loyalty to the First Order gets in the way. Maybe there are also external forces that threaten Rey and her unborn child, such as other Sith or enemies of the Resistance.
Redemption is another theme. Kylo Ren is a character who has made many wrong choices, and in some fanfictions, Rey plays a part in his possible redemption. Also, sometimes Rey's own journey towards the dark side and back can be a form of self - redemption. It's fascinating to see how different authors handle these complex ideas of right and wrong, and the characters' moral compasses.
Love or a complex emotional connection is also a frequent theme. Their relationship is often explored in a romantic or at least a deeply emotional way. The force bond they share in the movies is often expanded upon in fanfiction, with them having to navigate their feelings for each other while on opposite sides of the light - dark divide.
One possible motive could be to gain an advantage over the Resistance. By kidnapping Rey, who is a powerful Force user, Kylo Ren might think he can use her as a bargaining chip or extract information from her about the Resistance's plans.
One interesting plotline could be their initial conflict gradually turning into a reluctant admiration. As they face common enemies, they start to see the good in each other. For example, Rey might notice Kylo Ren's internal struggle between the light and dark side, which makes her more empathetic towards him.
One possible plot could be that they first struggle to co - exist in a post - war world. But as they are forced to interact due to some new threat to the galaxy, their old feelings resurface. They gradually come together and Rey becomes pregnant. They then have to protect their unborn child from the remnants of the First Order and other dark forces while also trying to create a new, more peaceful future for the galaxy.
The pregnancy could bring out a more protective side in both of them. Kylo Ren might become less consumed by his power - hungry ways as he focuses on protecting Rey and the baby. Rey, on the other hand, might soften towards Kylo Ren even more, seeing him as the father of her child. Their relationship could transform from a tumultuous one to a more stable and loving partnership as they navigate the challenges of impending parenthood.
One popular 'dark rey and kylo ren fanfiction' is 'The Dark Alliance'. It delves into their complex relationship and their journey together in a darker, more alternative Star Wars universe.
Another place could be FanFiction.net. However, the quality might vary more there. Some stories might focus on their complex relationship, perhaps exploring how Rey could be influenced by the dark side with Kylo Ren's presence. It's all about exploring different takes on their characters.