It might start with the couple entering a restaurant and being greeted by the waitress. Her warm welcome could be the starting point of the story.
Perhaps they both have an interesting conversation with the waitress. For example, the waitress might share some local anecdotes that fascinate the couple.
He might listen attentively and nod along, showing his interest in the story.
The story could end with the husband realizing that he doesn't want to be with a person who cheats on him, regardless of his plan. So he might quietly and amicably end the relationship, dividing their assets fairly. Or, if the wife realizes that she made a huge mistake and the husband's plan made her see the value in their relationship again, they could end up with a stronger bond. But this would require a lot of work from both sides, like being completely honest with each other about their feelings and expectations.
It might start with a simple friendly wager. For instance, they could be at a social gathering and start arguing about who is better at a particular sport. Then, out of the fun of the moment, they decide to bet on it.
It usually starts with the anticipation of all the fun things to come. People wake up excited, perhaps get dressed in their favorite casual clothes, and head towards the carnival grounds.
A dramione love story typically starts with their differences being highlighted. They are in different social circles within Hogwarts. Draco is part of the Slytherin clique that values pure blood and power, while Hermione is in Gryffindor, known for their courage and chivalry. Their first meetings are likely to be confrontational, like when Draco mocks Hermione's intelligence in front of others. But this very opposition is what can gradually turn into attraction as they get to know each other better over time.
Often, it starts with a major tragedy or trauma in Superman's life. For example, in the case of 'Injustice', it was the loss of Lois Lane that sent him spiraling. This kind of event shatters his idealistic view of the world and causes him to question his traditional moral code.
Another way it could end is that the husband asks for some time apart. During this time, the wife reflects on her actions and tries to change herself. Eventually, they might get back together if the husband sees real change in the wife.
Xianxia novels usually started with a mysterious scene, such as a mysterious island, a mysterious cave, a mysterious city, and so on. Then the protagonist would usually appear in this mysterious scene and begin their journey of Xianxia. In the beginning, the identity and background of the protagonist are usually introduced to let the reader understand their character and goals. At the same time, the protagonist will encounter some mysterious enemies or events to promote the development of the story. The ending of the story would usually give the reader a general understanding.
It might start with a conversation between the couple. They could be discussing their relationship and how they want to add some new spice. Maybe they read about the concept somewhere or heard from friends, and it piqued their interest.