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The four couples exchange partners with each other: the game of keys has begun. This will be the opportunity to fulfill their hidden fantasies, challenging the principles of their sexuality.
While the game of keys was unfulfilled, every couple is excited by the thought of what would happen if they opened up to new sexual experiences. Adriana decides to take action and gets her friends together to play the game of keys at her home.
Adriana remains obsessed with the idea of the game of keys, while Oscar tries to convince her to give up and rebuild their relationship instead. The constant presence of Sergio will test the couple's strength.
A casual encounter between Adriana and Sergio, two former high school friends, triggers the beginning of the game of the keys where 4 couples generate new sexual and emotional combinations in a dangerous and lustful game.