In normal circumstances, Belial nor any demon would accept giving their true name.
The reason was quite simple. While it was true that hearing pretty and cute things was something twisted for a demon.
Like when a normal person hears about atrocities or witnesses them.
In fact, you could say the disgust is something greater. It's a very unpleasant sensation for them, at a supernatural level.
But, while it could be considered torture for their ears, it stays there. In a repugnant and twisted sensation, even painful, but that's it.
In combat it would serve as a distraction, but wouldn't serve to defeat the demon in question.
However, that wasn't a conventional situation. Belial was tied up, vulnerable.
Lloyd was threatening to continue, and who knows how long he would be torturing him.
Maybe a year, maybe ten, who knew. But one thing was sure, it wouldn't be fun or pleasant.
Seeing it that way, it was more logical to give his name, as he would save himself that torment.
