Ryuuguujou - Futanari Otohime ni Okasarete...

Young Yuki was normal in every way but her enormous breasts. She awoke in an utterly unknown place. This was the Ryugujo. So said a person she met. Understanding the strangeness of her situation, Yuki's instincts kicked in. She was determined to escape......

Evade sex-starved people and escape the cursed Palace of the Dragon King!

[From DLsite English]