The dragon didn't hesitate to tell its story. In fact, after being imprisoned for so long, it was more than happy to speak.
In order to keep the torture he endured at a level he could endure, he pretended to be a lesser draconic being without intelligence. It got him this far, but he was still on the verge of breaking.
His story was one of greed. Though it was a rarer story, it was also something that happened many times in the world. All humans had the same thoughts and same desires at their cores, after all.
[Evidently, they wanted to tame me. No, they wanted to domesticate me and turn me into a breeder for inferior wyverns that they could use in battle.]
As expected, he was a young dragon who had not yet received a true name. He was called "Ruru" by his friends and family. It was a pet name for a young dragon, but it was the only thing like a name he had.