Place it right after the denial in your edit, letting the contradiction on screen do the setup, then follow it with Law & Order Dun Dun for a mock-serious verdict. For a second round of disbelief, open with You What before returning to the accusation.
About this sound
This three-second voice line asks whether someone was just caught wanting the thing they claimed not to want, delivered in a knowing, confrontational tone that puts the emphasis on the moment of discovery. It feels funny and awkward at once, turning a denial into a shared joke about being caught in the act. The line comes from The Boondocks.