Daniel and María are a young married couple. They are waiting for the arrival of their first child. María's sister, Sara, moved into the house in the last weeks of the pregnancy to help her. Sara's coexistence with the married couple rekindles the love she has always felt for her brother-in-law. But the feeling does not exist only in Sara. Daniel also feels attracted to his sister-in-law, something that does not go unnoticed by María. Daniel and Sara cannot hide that they love each other, but neither can they hide another feeling of not hurting María.