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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She doesn't like when I spend money on her, so when I do, she always tries to convince me that I don't have to, and it's really cute. All, every time I tell her she's beautiful, she does this little embarrassed smile and that's really cute too.