The Inconvenient Life of an Arousing Priestess, Volume 1 (manga)

Monster-fighting priestess Monica's impressive powers earned her a royal engagement, but... those powers come with a downside, arousing anyone affected, including herself! When her fiancé finds out, their engagement doesn't last long. While news of the 'indecent' holy woman spreads throughout the land, an unexpected connection from her past approaches Monica for help: he needs her powers, and the rumors don't seem to bother him.

His name is Richard, and unbeknownst to Monica, he is also a prince...