Put it right after the reveal, as the reaction that answers the confession, then follow it with a Bruh for disbelief or Emotional Damage when the excuse falls apart completely. Keep it as the centre of a reaction chain, with the setup clip before it and the payoff sound after it.
Über diesen Sound
This is a short voice clip of Uncle Ruckus drawling out 'well, well, well' in a slow, sly tone that stretches across about three seconds. It lands as mocking and suspicious, like catching someone in the act and enjoying the moment a little too much. The delivery makes it feel smug, knowing and playfully confrontational all at once.