The story of having sex with a cousin whom she has never met before in her mother-in-law's countryside where there is an H custom.
Sanae to Aya no Hentai Futanari Mikkai | Secret Perverted Futanari Meeting of Sanae and Aya (Touhou Project)
Yomeiri Mae no Wakai Musume wa Shougatsu ni Shinseki no Otoko to Sex suru Fuushuu | Unmarried young female traditionally have sex with a male relative on New Year's Day
[Hatoba Akane] Touma Senki Cecilia Ch. 1-19 | Demon Slaying Battle Princess Cecilia Ch. 1-19 [English]