It was a long shower for Gabriel who spent time thinking over his next course of action. He simply let the water from the shower head flow over him, plastering his damp hair to his skull. He came out with a towel wrapped around his waist and wasn't surprised to see Jackson already waiting for him.
He ignored him, knowing what this was all about already, and let the towel fall from his waist, exposing his nakedness to him without a trace of shame. They were both men after all - and Gabriel made sure to research his sexuality.
Jackson in question turned the other way when he saw his boss naked, it was disrespectful to stare shamelessly. Hence, he had his back turned the entire time Gabriel dressed up, until the sound of ruffling of clothes was over and he saw the boss was decent from the corner of his eyes.