Where do you guys reading doujinshi besides mrm?

Here

Batoto

You need to go to the tag here!!!
"Manga Tag: Doushinji"
https://www.mangago.zone/tag/Doushinji/#:~:text=Manga%20Tag%3A%20Doushinji

Dj is also another tag you can use that will give you more results
- https://www.mangago.zone/tag/Dj%20/