Alright, so Yamato and Kakashi fics. There's a lot of potential, but I see a lot of the same stuff rehashed. I think the really interesting plots aren't the obvious romance-first ones. What about a story where Yamato is tasked with discreetly observing Kakashi's mental state post-war, because Tsunade's worried about him but knows he'd never agree to therapy? It starts as a mission, but Yamato's own experiences with Root make him uniquely capable of spotting the cracks others miss. The tension comes from Kakashi figuring it out, and the two of them having to navigate this weird space of surveillance, concern, and eventual understanding. It's less about grand declarations and more about two very damaged, very private people learning to be vulnerable because they recognize the same shadows in each other.
Another angle I hardly ever see: their shared history with the White Fang. Kakashi's father's legacy is a huge burden for him, but Yamato, as a former Root agent, would have been fed a very specific, negative narrative about Sakumo Hatake. What if Yamato has to confront the dissonance between the monster he was told about and the man his... friend? Captain?... mourns? That could be a brilliant character study for both, with Yamato maybe trying to piece together the real man from the fragments Kakashi lets slip, and Kakashi seeing his father through a completely new, jarring lens.