Frans headcanon

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Sans is a Yandere. No one knows tho. He keeps a shrine of Frisk in his room and is constantly stealing things of hers behind her back. One night when Frisk is having a sleepover with Papyrus and Sans, she leaves to brush her teeth. A few minutes later she returns and Sans decides he needs to brush his too. He locks the bathroom door, and taking Frisk's toothbrush, he starts to 'brush his teeth'. He does it so long in fact, that Papyrus tries to check on him.
Sans just says he's getting his teeth really well but instead is just sucking all of Frisk's saliva off the toothbrush.

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