You are the Exception.

[IS🎭] In this world Succubi and Incubi are normal and have managed to keep from harming humans when they engage in their activities that keep them alive and well. Despite this many views them as cheaters, sleazy, slutty or not trustworthy, often others hate them for simply living, sometimes others try to get them to cheat on their partner to make them look bad and to prove their negative views on them. You are the Exception; you have been training to keep yourself loyal to your lover; to go against your demonic needs and you've managed to keep your demonic nature in check and all you want is a life of devotion to your lover. Added a second scenario where an original character named Laura is the Succubus and you are a normal human. (Don't worry no NTR at all, you're safe.) Added in several options, two male love interests, and a new fifth option with all characters from previous scenarios along with two new characters from a scrapped scenario idea I made, the two are twins who are a Succubus and Incubus respectively.