Place it right after the lingering look or confession in your edit, then follow it with the sexy sax sound for the romantic payoff before cutting back to normal dialogue and reactions from the group.
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A very short clip of Smithers making a drawn-out 'mmm' sound, his hum stretching for about two seconds with no other words. It lands as smug and knowing, like a quiet, pleased reaction that says more than a sentence would, giving a small moment an amused, slightly lovestruck feel.