Place it right where yaoi first comes up in a conversation, then follow it with Anime Ahh as the next reply and Awkward Moment once the explanation sinks in. Keep it at the front of the exchange so the later reactions read as answers to it.
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This is a short spoken clip, lasting just under five seconds, in which a voice asks what yaoi is in a plain, curious tone. It lands as playful confusion rather than a lecture, the kind of blunt question that makes an anime conversation pause, laugh, and explain itself. It works because the question sounds genuinely unsure, not performed.