In his true form, Autharyx had always been aware of the impression he was making on the mortals he dealt with, and had done everything he could to shape that impression into what he wanted it to be. In this human body, however, it is getting more and more clear that it likes to act directly on his feelings, with no input from his conscious mind at all. If this is how humans do it, it is probably a good idea to let it happen, lest he be seen as 'inhuman' when he's just trying to fit in. At least, that is the excuse he gives himself when he lets a smile flit over his face with every bit of excitement Viltez shows so easily. Even when the beast man closes his eyes, the dragon still regards him with a smile that could only be described as fond. 

Loath to admit it as he might be, he is rapidly getting attached to the mortal. He might be able to write it off as 'fascination', but what good is lying to yourself if you are very much aware that you are doing it? It's not like it actually matters, he tells himself as he listens idly to Viltez' musings about the workings of his tail. It's just some fleeting human emotion that comes with inhabiting such a weak form. If anything, it will help him be more convincing when he needs to be, and when it gets too tedious he'll just leave and shed the mortal coil that causes the weakness. It's not like this entire expedition will actually mean anything to him in a few decade's time, and while he's here he might as well immerse himself in his role fully, so to speak.Whatever he might feel around the half-breed, it's just his body being pesky and mortal, not something he actually needs to analyse and think about. Why bother to put thoughts into something that is probably both irrelevant and irrational? 

Decision made, it is very easy for him to smile back at Viltez when he invites him to join in something he calls 'catch'. He doubts it can be more complicated than throwing and catching stuff, so he doesn't bother to ask for the specifics.

"Don't you sound confident all of a sudden?" Viltez asks, not bothering to hide the slight smirk that seems to want to be on his face. "Well, far be it from me to deny you what you want," he says, keeping his pose relaxed before suddenly aiming a pinecone at his forehead. Dragons are nothing if not competitive, and this is all still in the guise of 'training' in the end. Let's see if he can't trick that tail into slicing up some cones it ought to be catching.