Responses
https://www.mangago.zone/read-manga/motomete_yamanai/
This maybe? I don't remember if it was mentioned that he's "autistic" straight up, but the whole story is about how the seme is "weird" and even the seme is aware of it since childhood that he's different from others.
I do have some stuff that I think has characters who I think are autistic
https://www.mangago.zone/people/tag/1614745/Autistic/?page=1
BL where a character is autistic and it's actually mentioned that they're autistic (no "autism coded")
Anything like this exists?