aside from reacting to the casualness of wanting to tame sentients, I also reacted to how noone in the story cares that mc is going to get targeted by "evil adventurers" aside from informing him about it.
Hello everyone. I gave birth to myself before I was born, with magic. I thought to myself, wouldn't it be great if I existed? And then I was born. But then the world doesn't seem so fun anymore. How do I unbirth myself?
Grandma your darkness is leaking. Not as much as my grandma though.
See the pattern that whoever beast he heal he tame, still request to heal the children.
@Salfaro thought of the same thing although it is not absolute obedience considering they keep being the pets of other kids. There is already a case, that catgirl little sister, he healed her so her over attachment might be the effect of this.