The vet confirmed that Twist was probably in a lot of pain even though he perodically rallied, and that it was better to not let him suffer, especially given cats' ability to mask discomfort.
We will read Cynthia Rylant's Cat Heaven tonight and for as long as we need to. We will remember that Twist was a good cat, a pretty cat, who deserved a much longer life -- but that he was adored during his short visit with us. (He really was The Best Cat.)
We will remember the good times. And I will try not to be too sad about the lack of a warm purring kitty snuggled against my back as I fall sleep.
[video description: black and white kitten trying to play with a straw held in a sleeping white teen boy's mouth.]