Koushaku no Himeta Kuchizuke

The Grand Duke of Sandford and Prince Louis are secret lovers. Although, disheartened by his partner's cool facade surrounding an exposed love affair with a woman, Duke Sandford is determined to incite the prince as much as the prince does to him "Unless I can possess you as mine alone, my prince, I'll never stop!" What would be the outcome of their passionate struggle in this forbidden fight for love?