Put this clip right after the accusation or suggestion line in your edit, then follow it with a shocked Damn for the other person's reaction. If the denial needs a build-up, place a quick Huh before it so the exchange plays as question, refusal, reaction.
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This is a short spoken German clip, about one and a half seconds long, of a voice saying 'wuerde ich mir nie erlauben' - I would never allow myself that. It lands as mock-indignant and playfully prim, the sound of someone acting shocked and innocent while clearly enjoying the denial and the dramatic little refusal.