Theo tensed despite himself, but he knew his wand was tucked into his sleeve if he needed it and knew that it wasn't likely he would need it either. His new landlord was almost a foot taller than him, but it was difficult to find anyone who wasn't taller than Theo - it wasn't that which had him on edge, just Theodore's usual tension-ridden inclination towards the defensive and hypervigilant.
He gave Aidan a smile back though, not totally gone off the paranoid deep end. "Thank you, really, thank you very much. I really appreciate this." he said sincerely, wholly grateful. "I'm Theodore Nott." he added, thinking he should introduce himself in person and holding his hand out towards Aidan; he didn't usually like physical contact with anyone, but Aidan had opened his home to him, helping him while he was down and Theo didn't think he could pay him back enough. The little flinch at voicing his surname was barely noticeable as well.