What event happened just before Brando decided to murder Luismi?

The event that put the idea of murdering Luismi into Brando's mind was a sexual encounter that occurred between the two friends. Brando had fallen in love with Luismi by this point, and one night when he was lying in bed next to Luismi, he placed his penis into Luismi's mouth while Luismi was asleep. The two engaged in oral sex and the next morning when Brando woke up, he immediately decided that he would need to kill Luismi to keep the secret from getting out.