Why would Grey object? His nose is in the air and things smell good.

He has the tinsel unwrapped and the lights, too. It takes him a moment to figure out that the lights need to be plugged in. So, he crawls over to do that and when they light up, he very nearly smiles. Ah. He likes that glow. When he figures out to undo the twist ties, he starts to unwind them, spreading the lights across the floor.

This draws the cat into the fray, starting to paw at the lights.