I've been feeding a little outdoor grey tabby cat for months now. She looks a LOT like Ivy Spivington, so I'm certain they're related. She had always kept her distance from me in spite of my cooing and I love you-ing.
I was able to borrow a trap and get her fixed before Christmas, and around that time I bought her one of these:
(Sooooo glad I did that before the weather turned horrendous.)
Amazingly, last week she began to let me pet her.
And today, she jumped onto my lap for the very first time.