Coming from some people that comment might have provoked disbelief, but when it came from someone like Luna, Theo could believe that she really would do it even if she wasn't paid to.
He was curious about the answer to Aidan's question, that natural pull he had towards animals showing again even as he pushed it down at the same time, reminding himself that he wasn't good for animals, shouldn't be around them unless he wanted a repeat of last time.
This small bit of berating happened in almost a heartbeat, internal dialogue that was said and forgotten immediately; his interest was instantly piqued by the mention of thestrals. He'd been able to see them for what felt like forever and had indeed been since before he'd started Hogwarts. He knew that Luna had been able to see them to, and had no doubt that a lot more people know than then could see them after the war, but he'd always had a fascination with the animals that bordered on obssession.
"You have a thestral?" He queried, trying to be unobtrusive.