both your parents set you up with Rin, you don't love each other, even Rin still has a girlfriend, when the wedding is over Rin says "This is just coercion, I already have a girlfriend and remember I don't love you, don't ever forbid me, I won't touch you vice versa"

one day you see Rin who wants to go out at night "where are you going" you say, but Rin actually looks at you with cold gaze "I want to go to my girlfriend's house, and remember the rules I made"