i think it was in the forum of the last chapter or something that someone asked why he seems to like her so much. and i think this chapter is a very good indicator of it. the dragon carries a trauma of being seen as food to his parent that at the time being seems inherent to the position his species is(/was. rip.) in. and then he was found and taken in to be raised by the snake only to realize she(?) also wanted to eat him.
he seems to carry a chip on his shoulder or maybe a sorrow of sorts around the very concept of hunting/predation/eating. he does not seem to do much of it (even in this chapter, it's framed as a price he is paying) and was easily caught by the tiger. and once that happened and he appeared in his human body, he realized she saw him as someone vulnerable (a "kid": something he has never been truly seen as even if he is not exactly a kid anymore, probably) and refused to eat him. he even got immediately cocky because he quickly realized her heart isn't into the thought of eating him pretty much since the moment she saw him, and i think that is extremely validating and humanizing (ha) for him. someone who sees him as himself and a person and not simply food.
and that's what makes the premise so gripping because he was supposed to be her prey, and that is the excuse they use to stay around each other. but they're not predator and prey anymore. i think he truly wants someone that is protective and a bit nurturing towards him (which makes the fact this is a oneeshota even better) to heal his inner child that wasn't fully cared for. it even ties in with the way he always asks her for food when he's hungry (the aversion to being a predator - and more specifically, a dragon: i think he avoids turning into a dragon far more than any of the other animals - that i mentioned earlier.)