Ride of the Valkyrie

The virgin Valkyries, warriors serving Odin, defend humanity from demons at the outskirts. Following a betrayal by the goddess Freya, who became a sex slave, the demons discovered the Valkyries' weakness. One Valkyrie was forced into sexual servitude under threat that her fellow warriors would suffer the same fate. After the demons seized the castle, they issued a challenge to all the captive men: to impregnate the enslaved Valkyrie in exchange for their lives.