Megami Ryoujoku ~Paizuri Hime Verdandi~

Verdandi is a princess of Valhalla. She is beautiful and lives a peaceful life. But one day, her country is invaded by monsters and Verdandi is kept hostage by them. The boss of the monsters, Roki, says to her, "If you give your body to me, we won't kill any more people." She doesn't understand what he means. He also says, "You just give me a blowjob...."