TheBiscuitQueen
The sequel to "Brother": With Makishima Shogo long gone, Akane and Kogami now enjoys life as a couple, though being a detective and in a relationship isn't that easy. On top of that, something, or someone, mysterious begins to show up, leaving trails, which will lead Akane to take some hard decisions that might affect her and Kogami.
Can be read on Fanfiction.net too: https://www.fanfiction.net/s/11244355/1/Brother-II-A-Shinkane-fanfiction