Place this clip at the reaction point after the flustered moment, then follow it with the Onii-chan Voice Clip as the answering line, or precede it with the Mayuri Tuturu Sound as a lead-in before cutting back to the main scene.
关于此声音
This is a just-over-one-second voice clip of Akeno Himejima saying 'ara ara' in a soft, calm, feminine tone. It feels teasing and flirtatiously amused, like a knowing reaction to someone getting flustered or acting too bold. The line is from High School DxD, where Akeno is known for that elegant, playful delivery.