Place it just after the reveal in an anime edit, following an Anime Ahh for the shocked reaction, then let Yamete Kudasai follow if the character backs away from the moment.
About this sound
This is a short 1.4-second anime voice clip of a woman saying “Ara ara, ma ma” in a slow, drawn-out, teasing tone. It feels playful, flirty and knowing, like catching someone in the act and enjoying it a little too much. The line comes from Kaguya-sama: Love Is War, where it is used as a teasing, older-sister-style reaction.