Bokura no Oukoku (Our Kingdom) is a yaoi manga series created by Koujima Naduki. The story follows the life of Akira Nonaka, a country boy who has lost his parents and recently, his grandmother.
However, he is soon enough forced to live in a mansion, home of the most wealthy and powerful families in Japan, the Takatou.

Crimson Spell is a yaoi manga series created by Yamane Ayano. Prince Vald is forced to use his family's cursed sword to get rid of hoard of demons attacking his kingdom.
The curse manifests itself as turning Vald into a bloodthirsty and lustful demon at night for Vald seeks out for Havi, a sorcerer to help him lift the curse.

Okane ga Nai is a yaoi manga series created by Hitoyo Shinozaki and illustrated by Tohru Kousaka. Yukiya Ayase is a university student.
His cousin Tetsuo Ishii betrays and sells him in an auction to settle his heavy debts. Ayase is then bought by Somuku Kanou for 120 million yen and has to repay him his debt with his body.

Shounen-Ai and Yaoi, were popular Japanese terms for female-oriented fictional media that focus on male relationships with implicit and/or explicit content, usually created by female authors.
Fanfiction is a broadly-defined term regarding stories written by fans of an original work not their own.

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