Doujinshi

From OLSEncyclopedia

Doujinshi are fan-made manga, usually deriving from another, more prominent mangaka's work. A good portion of doujinshi is hentai, because honestly, why bother with anything else non-canon?

I'd link some hentai manga up in here but if/when AKo comes back he'd kill me.

So instead you get a page full of fail.