I think you'll find most of the activity concentrated on Archive of Our Own, honestly. That's the undisputed hub for anything shxtou x Vox, or really any 'Holostars' or 'Nijisanji EN' related pairings. The tagging system over there is so meticulous you can find exactly the kind of dynamic you're looking for, whether it's rivals-to-lovers, established relationship fluff, or some of the more speculative dark academia AUs I've seen pop up.
The beauty of AO3 is how the community drives the tags. You can track a ship's popularity by the sheer volume of works, and shxtou/Vox has definitely carved out its own corner. I've noticed a lot of writers seem to draw from their banter during collabs, then extrapolate it into these really intricate emotional landscapes. Sometimes I'll start reading a fic tagged 'mutual pining' and end up completely losing an afternoon.
You might also want to check specific corners of Tumblr. It's less about hosting full-length novels there and more about snippets, headcanons, and moodboards that fuel the fandom imagination. A lot of those ideas eventually migrate over to AO3 as fully-formed stories. The Discord servers dedicated to either talent can be treasure troves for finding links to fics hosted elsewhere, too, but that's a more social, real-time kind of discovery.
Man, the 'shxtou' thing's gotta be a typo for 'Shoto,' right? As in Shoto Todoroki from 'My Hero Academia' crossed with Vox Akuma from 'Nijisanji EN'? That's a wild mashup that shouldn't work but somehow has a dedicated corner on AO3. The dynamic is built entirely on contrasts—Shoto's internalized, repressed fire-and-ice trauma versus Vox's ancient, performative demon lord theatrics. Writers love to pit Shoto's stoic, socially-awkward hero-in-training vibe against Vox's flamboyant, centuries-old wisdom (and his tendency to call everyone 'darling').
It creates this fascinating pressure cooker. You get fics where Vox tries to 'mentor' this emotionally constricted kid, poking at his walls with centuries of practiced charm, and Shoto just... doesn't react the way anyone in Vox's world would. The tension isn't just romantic; it's about fundamentally different ways of existing. Is Vox a corrupting influence on a future hero, or is he the one person who sees past the 'hero legacy' crap because he's lived through so many eras himself? I've seen some amazing takes where Shoto's ice quirk is a metaphor for his emotional state, and Vox's whole demonic heat thing literally and figuratively thaws him, which is cheesy but effective.
Honestly, half the appeal is the anachronism. A 400-year-old demon streamer and a 16-year-old superhero student navigating a shared apartment or a demon realm mission is inherently ridiculous, and the best fics lean into that awkwardness before diving into the real emotional meat. The power imbalance is huge, so writers either de-age Vox into a more peer-like form, age Shoto up post-canon, or make the imbalance the entire point—a study in manipulation, care, and finding unexpected understanding across a chasm of experience.
Honestly, the main hub for that pairing is going to be Archive of Our Own, no question. The tag system is meticulous, and you can find everything from angsty post-fight reunions to wildly speculative cross-dimensional AUs. I've been following the tag since the whole... incident, and the creativity in salvaging a ship from what seemed like a nuclear fallout is genuinely impressive. Some writers lean hard into the redemption arcs, others just ignore the drama entirely and craft fluffy domestic scenes. It's a fascinating microcosm of how fandom processes public conflict.
If you're looking for something more structured or forum-like, I occasionally peek at SpaceBattles or Sufficient Velocity. The discussions there can get super analytical, sometimes dissecting the characters' psyches more than the romance itself, which yields a different flavor of story. Wattpad has its share too, but the quality is way more variable in my experience. You'll have to sift through a lot of less-polished work to find the gems, but they're there if you're patient and use specific search strings.