Parella de tres

The story

Ana and Marta are good friends but very different women. Ana is a housewife whereas Marta is an agressive lawyer, single and very independent. Ana is married to Santi and after a crisis she proposed Marta to be the lover of her husband to save her matrimony. Santi does not suspect anything and the triangle works fine during years... till Santi begins to go out with another person.