[ The humming doesn't bother Cale at all, too pleased by how happy Sophia sounds to consider it anything close to annoying. It's soothing, which is something Cale could use more of these days, and combined with the brushing of his hair it makes him feel sleepy.
Relaxed and on the cusp of dozing off, a soft, rhythmic rumbling begins reverberating from Cale's chest. ]
[Sophia pauses when she notices after a long moment, not stopping the brush but falling silent to listen. She tries to parse what the sound is, and before long it occurs to her that the sound is familiar.]
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Relaxed and on the cusp of dozing off, a soft, rhythmic rumbling begins reverberating from Cale's chest. ]
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...cat...
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...Not quite, but close.