Searching for the Sparks

Both the Tianquan and Yuheng are summoned for an important Qixing mission, which is.. Finding a lost cat? The lead they have is only that it's last spotted at the Liyue Harbor. Can both of them co-operate in the simple-yet-urgent task? It may not be as simple, after all... A fanfiction gift for Nagi on Twitter, who has requested a Keqing/Ningguang fanfiction.