I have read a couple most are not that great, but there are some great ones.
Aaahh I need to find the good oness
http://www.mangago.zone/read-manga/nounai_ren_ai_no_susume/ is my favorite. not accurate, but fun
Aaaaww it was so cute ^_^
I hope you're not saying it's not accurate because it shows a multiple rather than someone with DID? Multiples exist. And they are neither ill nor do they have a disorder. If you're talking about something else, like how they seem to change their outward appearance even a little or anything along those lines then I would have to agree with you.
I know people with multiple. And have yet to find any that accurately represent them in writing. the other personalities can't communicate with each other. Nor can switch at will. There are triggers. So it makes them hard to write for.
Omggg this is gonna be so goood. I don't think I've ever read a yaoi with multiple personality disorder aaahhh