25 Days of Gays: Departure (2015)

Departure is a coming of age drama from the UK. It centers on Elliot (played by Alex Lawther), a teen who travels to the South of France with his mother to clear out the family's summer home in the wake of his parents' crumbling marriage. While there, the duo befriends a young local boy Clément (played by Phénix Brossard), who helps to awaken Elliot's sexual desires and provides the catalyst for mother & son to confront their issues. Phénix & Alex both show rear nudity during the film. There are a few glimpses of frontal nudity from Phénix as well.

Phénix Brossard

Alex Lawther