Ahhhhhhh man I'm so sad this is in all likelihood abandoned. It's such a fun premise! All three personalities interact in such hilarious way and with well developed voices, it makes me wish a slightly insane Inuyasha would come up in fics more often. You set up an intriguing plot with all the talk of prophecies, Sessh's mom's conspiring, the unique twist on Inuyasha's time stuck to a tree and lasting effect on him, it's such a shame we'll never know what happens next. I could see it setting up to be quite a saga of a fic if you ever keep writing for it. With engaging characters, incredibly erotic smut, and a creative plot it ticks all the boxes that makes a reader hooked and bitterly disappointed to be left on a cliff hanger. I spent a while checking other sites hoping you just migrated to somewhere else and kept writing for this fandom but since you mentioned a writing hiatus on AO3, I'm guessing it isn't meant to be. Hopefully you still get notifications on here and know your older fics are still getting read and loved 15ish years later!
i hope to see an update one of these days