Place it right after the request or question in your edit, as the direct answer that closes the scene. For a reversal, follow it with No No Wait Wait when the character changes their mind. For a bigger reaction, put Oh My God Wow just before it to build up the moment.
關於此聲音
This is a short spoken Italian phrase, lasting about a second and a half, delivered in a formal, eager male voice saying yes sir, certainly sir. It feels instantly deferential and a little over-the-top, like someone agreeing far too quickly and too politely. That exaggerated politeness makes it funny, awkward and perfect for a sarcastic yes.