Kellen was at his breaking point.
Rhys hadn't left the whole time, and Kellen, while he sobered up from the medication, vibrated the whole time from holding himself back. Brent, being Brent, noticed that something was up and used having to talk to him in private about one of the Guides to rescue him and ask him what was wrong.
When Kellen told him it was because he was having a hard time not jumping Rhys, Brent's grin had been full of mirth, and his laughter had filled the air.
"You are well and truly corrupted, my friend. Good luck. I pray for Rhys." Brent had continued to laugh even though Kellen was very serious. He was able to give Kellen a break, and those few minutes had helped him survive the guiding session with Taylor, seeing his parents off at a temporary apartment while they decided on what they wanted for sure, and making his way to the apartment with Rhys.