I see it differently... in fact I have a different interpretation of the threesome scene, if you stop to analyze the threesome scene we obviously see that it was a dream of Laura's, dreams are nothing more than experiences, feelings... In the case of the film, this erotic dream she had is as if it were a "reconciliation" between Massimo and Nacho. The only way to get Laura is for the two of them to love each other, which shows their kiss M & N as a form of reconciliation, but we know that Massimo and Nacho love Laura so much that they would do anything to win her. . if there was a 4th part to the movie I think we'd see an expectation from Laura about her domination by the two of them, and possibly a polyamorous relationship... that's how I see it, I could be wrong but