Place it at the end of a reaction beat, just before the scene cuts away, then follow it with an awkward moment sting to hold the beat. For a larger anime reaction, pair it after an anime ahh, letting the second cue close the sequence.
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This is the tiny drop cue tied to the sweating emoticon in Blue Archive, lasting under a second. A soft, springy plip suggests a bead of sweat forming, giving a scene an instant jolt of nervous embarrassment and awkward tension without any words. It comes from the mobile role-playing game's animated reaction stickers, where the sweating face signals a character caught off guard.