Hey nonnie~ this blog is dedicated to finding any yoi fic regardless of ship/tags/warnings or whatever so you’re good! I’m not gonna pass judgment or police fandom experience so anyone can request anything and I (with the help of my lovely followers/the yoi community) will just try my best to find it. :)
Having said that, I believe you’re looking for Kingdom Locked Up by soliloqui [M, 42K] *WIP. It’s actually a Yuri-centric fic and slowburn/endgame Yuuri/Victor/Yuri but yes, Otabek is aromantic and I vividly remember the discussion you described.
“What?!” he snaps eventually, and at least the piggy has the decency to look sheepish when he’s caught out.
Yuuri takes a quick breath and mumbles, “I guess I hadn’t realized you had been such a big part of Viktor’s life, before,” and oh.
“Don’t fool yourself, piggy.” Yuri looks away, busying himself with getting a soda even though he has absolutely no reason to have to hide. He’s feeling bitter, not sad. “From the looks of it, I was easy enough to cut out of it.”
The moment is broken, and Yuri is proud to say he manages to stay miffed at least until the savory sent of miso soup is wafting through the apartment a few hours later and Yuuri calls him to table.
(It might not start with fondness, but familiarity is probably the next best thing.)