Himekishi Lilia

The kingdom's heir, Princess Lilia, faces a challenge from her brother, Prince Dirk. To seize control, Dirk forms an alliance with a demon. Their goal is to extract Lilia's concealed power, which requires subjecting her to extreme states of sexual arousal. Dirk captures not only Lilia and her devoted knights, but also his own mother, to serve his plans. The success of his scheme depends on delivering this power to his demonic partner within a limited timeframe.