Whenever I scoop her kibbles into her dish, Billie will come over and rub her head on my hand to thank me for her supper (whereas Simon will slap my hand out of his way).
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When we're in bed and I'm feeling a little more fragile than usual, Simon picks up on my delicate state and will curl himself (sometimes purring) around my head as if to try to quiet those thoughts and worries that torment my sleep.
I'm a very lucky girl!