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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When we are modding our cars and she makes a mistake she goes "ohh" with the cutest face. But what melts me is her smile when she knows she's wrong lol so adorable.