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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He has the humour of a 10 year old, but that works in his favour after arguments. I automatically burst out laughing and forgive him. Adorable, little blam.