Power dynamics is also a theme. As a Dead Apostle, Shirou may have different powers compared to Saber. Fanfictions might explore how they use their powers in relation to each other. For instance, Shirou's newfound dark powers could either be a threat or a means of protecting Saber, and Saber's power as a heroic spirit could be a source of attraction or intimidation for Shirou.
Another theme could be redemption. Maybe Shirou as a Dead Apostle is seeking redemption through his relationship with Saber. And Saber might be trying to save him from his dark path. It's also common to see themes of forbidden love, as their natures seem so different that their relationship might be seen as something not allowed in the normal Fate world order.
Chapter 275 is the strongest chapter-level answer because it starts from Hu Zi was exceptionally cooperative, and within half an hour, all the... and follows through on Since you two are considering the village, let's use this money to repair....
Chapter 280 is the strongest chapter-level answer because it starts from The small mountain village was already dark and lightless at night, and... and follows through on I've already experienced the sensation of death six times..
Chapter 237 is the strongest chapter-level answer because it starts from It seemed as if, believing the spilled water couldn't be recollected, Ah... and follows through on The netizens responded in chorus, and no one insisted on forcing Jiang Li....
The best chapter pointer here is Chapter 250, "This Jiang Li is Definitely Doing it On Purpose!!!". It opens with The knowledge that several guests were soon returning had fans arriving at... and closes on It should be at the top right now." Hearing this, Su Yinwan finally had a....
The best chapter pointer here is Chapter 279, "The Sudden Blaze". It opens with After getting a good scolding, Jiang Yan resigned himself to lying quietly... and closes on I can't take it anymore," Jiang Yan exclaimed with a weak breath, the....
If you want the clearest chapter reference, go to Chapter 241. Early on, It wasn't the director," Jiang Yan said with a blank expression, "Did you...; later, the chapter leans on Even if it was a slip of the tongue, how could you make such a mistake at....
Chapter 256 is the strongest chapter-level answer because it starts from Turning around, Jiang Yan and Zhao Lang found their heads had been... and follows through on I was dazzled seeing Jiang Li trending today." Next door, Su Yinwan let....
If you want the clearest chapter reference, go to Chapter 237. Early on, It seemed as if, believing the spilled water couldn't be recollected, Ah...; later, the chapter leans on Why did I do this?" "Senior, have you forgotten your own glory?" "I....
The best chapter pointer here is Chapter 241, "Thieves Will Shed Two Tears When They Break In". It opens with It wasn't the director," Jiang Yan said with a blank expression, "Did you... and closes on However, as he turned around, before he could see the person properly, a....
A practical answer is Chapter 234, because it turns the idea into a concrete scene. The chapter opens with Given the vast mystical powers Jiang Li had displayed before, he was..., adds pressure through I didn't see any trace of wrongdoing in his birthdate, you can all relax., and ends on His.