Place it at the very end of a short edit, after the setup line and the reaction shot. Pair it after a surprised gasp for contrast, then follow it with kids cheering when the scene needs a group celebration instead of a one-to-one reply.
About this sound
This is a 2.4-second voiced kiss sound, a soft playful 'muach' delivered like a quick peck by VTuber Vestia Zeta. It feels cute, affectionate and teasing, instantly readable as a sweet joke rather than a serious romantic gesture. It is associated with Hololive Indonesia and circulates as a fan-shared reaction.