Oh. That's a valid point. On the other hand, we don't have anything to go off of except species wide stereotypes, no particular reason to believe those stereotypes inaccurate, and potentially genocidal consequences if we fuck up. (Specifically, if the dragon decides that K8P should go back to just being 8P, pulls it off in spite of our best efforts, and the Rune of Valaya fails.) I, personally, am inclined to be cautious on those grounds, but I'll admit it's a flaw in my mindset.
However.
One could as well say that it is a stereotype of sapient individuals to be uncomfortable with polyamory, and you would not be far wrong. Of course, like any stereotype, there are exceptions, but people in general are statistically quite unlikely to be poly-friendly. Proceed to the previous argument about "this could (not likely, but genuinely possibly) go really spectacularly wrong so let's be careful."
Granted, this is still stereotyping, just on a grander, more universal scale. At least it's not a racial or species stereotype? But if you eliminate the argument entirely, it follows that we have to get to know the dragon as an individual before raising the question of a poly relationship and so still shouldn't be trying to date the dragon and someone else at the same time right off the bat.
In conclusion, sure, I guess if my issues are "willing to operate off of stereotypes temporarily in the lack of any better information", I'm projecting, I guess.
I'm gonna stand by "THE DRAGON IS BIGGER THAN US AND BADDER THAN US CAN WE NOT TEST THEIR FORBEARANCE TILL WE KNOW THEM BETTER PLEASE AND THANK YOU", though.
