Himekishi Lilia - Ep.4

Based on an adult game by Black Lilith Studios. Princess Lilith is next in line for the throne. However, her brother, Prince Dirk, wants to become king very badly. For this, he makes an agreement with demons who promise him the throne in exchange for his sister's hidden power, which can only be obtained by sending her to the highest level of sexual ecstasy. He ends up enslaving both Lily and his mother, but will he be able to fulfill his agreement with the demons in time?