Konyaku Hakida, Hatsujou Seijo

Monica is the most powerful priestess on the front line of the war against the demons. She is chosen to be the Crown Prince's fiancée because of her holy power. However, her power comes with a nasty side effect. The person to whom she applies her power will go into heat.

When the Crown Prince found out, he spitefully calls her a "slutty saint" and broke off their engagement. The news of the lust-inducing saint spreads throughout the country.

Monica is at a loss, when Richard, a fellow soldier from the war, asks Monica, "Would you like to come to my country?"
He tells her, "My brother and his wife are infertile and they can use your help."

What Monica doesn't realize that he is no ordinary soldier, but the brother of the Emperor himself! And the people she would be helping would be the Emperor and his Queen, of course!

The workaholic saint in heat, and her fiercely devoted and doting imperial prince. A love story dripping with purity!

(Source: Shufu-to-Seikatsusha, translated)