The tickling earns Sans the questionable reward of a moment of giggling perhaps a bit louder than really necessary. But Frisk quiets back down quickly enough, and they consider his offer for a moment before smiling and moving to wriggle under the blanket and snuggle up to him properly.
"Okay. But we're gonna have our lesson after, 'kay?"
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"Okay. But we're gonna have our lesson after, 'kay?"