Okay, so I'm about 2 years late to mention this, but doujinshis aren't necessarily yaoi mangas.

They're basically just fanmade mangas made by other artists. They're usually popular for featuring ships more often than the official content (or something).

This is just me correcting a past mistake, lol. You'll know what I'm talking about if you read one of the older Hero Diaries.

(Was it A Hero's Diary II? A Hero's Diary III? A Hero's Diary IV?)