Place it right after the flirtatious setup in a short edit, then follow it with a Bruh clip for the next beat and an Emotional Damage clip to close the scene, keeping the sibling reveal as the centre of the sequence.
關於此聲音
This short clip is a single spoken line, 'Dude, that's my sister!', delivered in under four seconds with a sharp, caught-off-guard tone. It lands as awkward, funny embarrassment, the kind of instant realisation that makes everyone in the room wince and laugh at once. It comes from Awesome Ride by Rated A for Awesome.