If you aren't dating anyone at the moment, just pretend you are.
I'd say the cutest thing she does is since she's originally from Honduras, she speaks Spanish really fast when she gets mad at me; I haven't the slightest idea what she's saying, but I think it's just absolutely adorable.
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My girlfriend is really playful so she will accidentally hit me and the moment she realizes her eyes get really big and she'll hug me tight and say she's sorry and act like a child and it's adorable