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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Because I'm 6'3 and she's basically up to my sternum, whenever I'm doing something like cooking or cleaning the car she pulls on my clothes to get my attention like a little kid. It's so adorable.