Place this clip right after the reaction shot it is answering, then follow it with the Mayuri Tuturu Sound Button for a lighter anime girl voice, or swap that order and close the sequence with the Yamete Kudasai Sound Button when the edit needs an embarrassed payoff instead.
About this sound
This is a short two-second anime voice clip of Akeno delivering her signature 'ara ara' alongside a soft, drawn-out hu~ hu~. It feels playful, teasing and a little flirtatious, like a character who knows she has caught you off guard and is enjoying every second of the reaction it gets.