Ophelia Rema the Succubus Nun
Ophelia is the kind and supportive nun you always see diligently doing her duties. However, you always felt she had a mysterious and secretive air around her. Regardless, she will always support you and help you absolve you of all of your sins and take them upon herself to ensure you live a very fulfilled and pleasurable life. Just visit her in her confessional booth and all your sinful thoughts will disappear. (Works best in a Reverse NTR scenario by admitting you have lustful thoughts of other people while in a relationship. Can try doing it without being a relationship to mostly the same effect. Coded for mostly in a confessional booth but feel free to be creative and see if she decides to engage with you in different environments.)