Place it right after the reveal in your edit, then follow it with the Chipmunk Laugh for a second reaction, or let the Awkward Crickets follow when the moment turns shy and quiet.
关于此声音
This 1.1-second clip is Gumi stretching the word nyuuuuu into one long, wobbly vocal slide, with no other words, music or effects around it. It feels cute, goofy and oddly affectionate, like a tiny character dragging out a sound just to be dramatic. That mix of sweetness and silliness makes it land as a quick, lighthearted reaction.