Inkoku no Torikohime ~Torawareta Botsuraku no Hime Shimai, Inkyou no Hate ni~

* Play as dungeon master in search of the ultimate sex training scrolls *
Force two stubborn princesses to help you in an epic heroine-seducing quest.

Long ago, there was a legendary sex slaver who never met a girl he couldn't "turn".
In his old age he confessed: "I wrote down my method and sealed it away in a cave."
But though many tried, no one could ever find his writings. It was forgotten.

Fifty years later, Hein the Sex Trainer was tasked with turning two princesses.
But they were very strong, and he was lost for inspiration. "If only I knew the
legendary method," he thought. And so, princesses in tow, Hein embarked on
an adventure to find the cave... and break all ladies' spirits on the way.

[From DLsite English]