I Accidentally Tamed the Beast in Heat

Olivia heads to the Duke's castle to save a missing village child, where she encounters a massive beast instead of the Duke. Olivia persuades the beast, offering herself as payment, and stays in the Duke's castle. However, the Duke, who was said to be away, shows no sign of returning, and Olivia senses a strange aura around the beast... -It's best to avoid him, as the Beast is entering his heat. * * * "Haa...!" "Are, are you alright?" Olivia supported the beast as he collapsed from the fever of his heat, and suddenly felt something was off. 'This' wasn't the beast she knew. "The Beast and the Duke were the same person." Only then did she realize the connection between the Beast a...