First time the male lead character gets away with his dignity in one piece AND alive in a story by Iris Art.
Sera and Kaito are a couple and both were like magical sex doctors cleansing curses through sex not the best job but the payment was quite good, a costumer came asking for curse cleansing and because that implied sex ofc. Sera eventually fell for the sex she had with this one costumer and went as far to lie to her BF about not doing any job that day and told MC to go, however he hid while spying on her only to discover that Sera just called the costumer letting him in their house much to his dismay, the other guy called her out that there no longer was a curse on him and she just called him for sex and that she knew and still called him which she admitted liked this relationship, he got her hooked on sex so hard she was willing to give her money to him including MC's savings to him, then we're told he is a scammer and got Sera hooked with sex so she couldn't let go and willing to give him money for more sex, MC got heart broken because he was saving up for their future, marriage, house and childredren but witness all of this debaucher he snapped out of it.
At the end Kaito rips the pendant from his neck (both had it as a symbol of their commitment as a couple together) and threw it away, he's glad he didn't marry her and plabs to break up with her, pick her shit and throw it at the other guy's house as he thinks he can't wait too see how her face will look like.
Sadly, that's where it ended. Half open ending as we never got to see Sera get dumped by MC.