There's a loud, echoing noise as Lucifer snaps his maw in displeasure. He'd been having fun, this was amusing, and now the Guardian was going to go and ruin it all.

He couldn't have that, he had no desire to go back to the crushing boredom of the Venusian wilds, and so as thr man moves to leave he starts, quick as a flash, and intercepts him with a low warning noise.

Come now, you're being such a bore. No need for that.