I know I've read it on this site before but I don't remember the title, it was a pretty short read like about one volume long and it was about this yaoi manga author who wrote mainly fluffy and wholesome BLs and he was a huge fan of this other yaoi author who wrote a lot more darker and smuttier BLs (he had dark hair and clothes, slouched a bit and always wore a black face mask) and he ended up somehow working as his assistant I think?
If this helps I remember finding the title off of Pinterest that had a screenshot of one of the pages where the first guy licked the other guys eat and he came from that.
PLEASE lemme know if yk what I'm talking abt I'm getting desperate here TT