Cousin, Cousine

Two cousins, Marthe and Ludovic, meet for the first time at a lively family wedding. While their spouses Pascal and Karine are away, they strike up conversation and share a growing curiosity about one another. They dance together as the wedding carries on.

Later that week, Ludovic meets Marthe for lunch and drops a startling truth: her husband is having an affair with his wife. They talk privately about the web of relationships surrounding them, testing boundaries and trust. The conversation plants the seed for a complicated attraction.

Pascal informs Marthe that he has broken off all of his affairs and that from now on she will be the only one. The message shifts the balance of power and heightens Marthe's emotional conflict. The couple's dynamic becomes more entangled as a result.

At a family gathering at Marthe's mother's house, Ludovic's teenage daughter Nelsa shows slides she took at the wedding, including compromising photos of Pascal and Karine. The revelation intensifies the sense that relationships in the family are unstable. The moment sets off a chain of emotional reactions.

During the funeral of Marthe's mother's new husband, Ludovic's father arrives and offers condolences, revealing his own recent loss of a spouse. The event deepens the sense of family fragility and foreshadows new connections between generations. The mood is tense but intimate.

On the way back from the cemetery, Marthe and Ludovic become better acquainted. Marthe shares her love of swimming and singing, which hints at their growing compatibility. Their resumed friendship hints at a boundary-crossing attraction.

The following week they meet for lunch, buy bathing suits, and swim in a public pool. They enjoy each other's company so much that they decide to spend the rest of the day shopping and seeing a film. The day strengthens their personal connection while keeping their relationship non-romantic.

To observe Pascal and Karine's reactions, Marthe and Ludovic arrange to meet by chance at a restaurant with their families. It becomes a playful test of how their spouses respond to the closeness between the two.

They meet again at the swimming pool and acknowledge that their relationship is special and must remain platonic. The confession marks a turning point, even as their bond deepens. They resolve to protect their existing commitments while cherishing their connection.

At another family wedding, Pascal and the groom's father fight over a business deal, prompting Marthe and Ludovic to leave and spend the day together. The event underlines the instability around marriages and presents an opportunity for them to be free from obligation.

They return to find Pascal drunk and harassing guests, and they help bring him home. Marthe's mother and Ludovic's father begin to realize their own compatibility might be limited, prompting plans to visit his vineyard. The evolving families’ dynamics push the two toward a more personal decision.

Marthe and Ludovic decide to do something for themselves, stepping away from what others expect of them and embracing their own needs. They acknowledge the absurdity of keeping their bond strictly platonic. The moment signals the film's emotional pivot.

That Saturday, Marthe and Ludovic spend the day together, having sex for the first time. The act marks a major shift in their relationship and tests the limits of their commitment to others.

The following morning, they extend their stay for another day, sharing recipes and bathing together as they deepen their intimacy. They begin to imagine a life beyond their conventional roles.

In the days that follow, Pascal's philandering continues, Karine leaves and returns, and Marthe's mother and Ludovic's father realize they aren't as compatible. At a Christmas gathering, Marthe and Ludovic lock themselves in a bedroom and have sex all evening while their families join in the festivities. Finally, they say goodbye to their families and ride off into the night together.