I've also started my own fanfiction. The link is
HERE, and it's also in my sig below.
It's aptly titled "The One Ultimate Way" as its based on the non-canon SS "There is but One Ultimate Way", which is my own take on how that side story continues. The pairing is obviously, KiritoxHarem.
Since the setting is post-Alicization; the fanfic, of course, will contain spoilers up to that point.