One Wild Moment (2015) on Netflix

Plot summary

Antoine, a Corsican with firm ideas about women, returns to his family's isolated house on the island for the summer without his wife, bringing his seventeen-year-old daughter Louna. His old friend Laurent, who is divorced, comes along with his eighteen-year-old daughter Marie, a friend of Louna's. The two men look forward to quiet days in the countryside while the girls want nights out in discos. Louna, who dreams of a great romance with a grown man rather than passing encounters with boys her age, sets her sights on Laurent. After they have both been drinking, she swims at midnight and he succumbs. Laurent feels his guilt toward Louna, toward her parents and toward his own angry daughter, and tries to slow the relationship down, but her ardor only grows.