Lovely probably isn't even how Castiel would describe his husband, but if Q wants to, he thinks that's very nice of the other man to assume. Dean is crass, a bit rude, and exceptionally good at threatening people. But he's also righteous and beautiful and more caring than anyone else he's ever met. It probably all balances out.
"Six months," he says, well aware that's not a lot of time considering that whole marriage thing. But it works. "What about you and John?"