He Became Human
After he had healed, the dragon refused to leave. He was sad at the prospect, and she felt his pain because she was the same. After months of getting to know this brilliant, beautiful creature, how was she supposed to just let him go off and get attacked again? Someone his size wouldn't be able to avoid the cavalry for long. And that's when she came up with the idea, to keep him safe she must make him as small as she was.
It took a long time to figure out just how to do it, but eventually she was able to turn him human, at least temporarily. It was something that would have to be kept an eye on so that he never had to revert back to his dragon form, but even in his human form he was still very much constrained. He was clearly still a dragon, purple hair with tiny horns for eyebrows and pointed ears. She still had to keep him hidden from the humans, which should have been easy to do with how far they'd lived from them.
Eventually, my mother introduced him to her friends, who were unsure to say the least. It was against God's will to mess with an animal's being, they had warned, to which she said that if that is so He may strike her down that very instant; however, no lightning stuck, no storm pursued, and the sun remained ever the same.