Idea for story: a couple hate being married to each other, but they live in a community that only allows for divorce if the spouse commits adultery. So they both independently recruit or hire someone to seduce the other so they can be free to divorce.
This could lead to a few results. Either it works and they end up just splitting. They could realize it was a mistake and decide they do love each other and stay together. This could lead to divorce and 2 new relationships with the seducers. The seducers end up meeting and falling for each other…