Put it just before the moment someone notices the bite, then follow it straight away with the Classic Punch Sound for the swat, and finish with a short reaction clip to complete the joke.
このサウンドについて
This clip is a close mosquito buzz, a thin, high-pitched whine that hovers right by the ear, the kind of sound that makes you look around the room. It feels irritating and funny at the same time, tense in a small way, because it puts you on edge while also making you smile at how familiar that summer annoyance is.