[That's enough to startle Sans into silence. He goes very still. Even when he realizes what's happening, he doesn't know what to do. If he said he was fine, she'd probably just get upset, right? You'd have to be really stupid to think everything that just happened was fine, and Sayori isn't stupid.
Eventually, he loops an arm around Sayori and returns the hug.]
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Eventually, he loops an arm around Sayori and returns the hug.]