For a while after that, things are generally quiet, but the twins finally do get in spankable trouble. You remind them of the new method, and they both agree. You take them to their rooms, get their bottoms bared, fetch the spanking spoon, and the boys play odds n evens. Donald wins, so he gets to go first.
Your spankings for these guys aren't harsh, and six smacks later, with that little bottom reddish, and Donald crying pretty hard, you help him sit up for a quick hug, then have him stand, and tell Daniel it's his turn.
In response, he shakes his head 'no', and begins to back away.
And the ball is in your court.