Place it at the reveal in a short edit, after the Romance Sound Effect sets up the moment and before the Vine Boom Sound Button punctuates the payoff, then cut to the reaction shot.
About this sound
This is a roughly ten-second clip built around a warped, wobbling vocal that bends a familiar sweet melody out of shape. It feels dreamy and slightly eerie, like a love song heard through a broken speaker. It is a distorted remix of 'Pretty Little Baby'.