Cautious:
* "Greetings... uh... both of you?"
* "I... I don't mean to alarm you, but you have two heads." (Said with a nervous chuckle)
* "Are... are you aware of each other's thoughts?"
Cheeky:
* "Well, this is certainly a unique sight! Double the fire power, I guess?"
* "Does one head prefer chicken, and the other fish? Just asking for a friend."
* "I'm sure you're both lovely, but which one gets to talk?"
Humorous:
* "So, who's the brains of this operation?" (Pointing at one head)
* "Are you ever in trouble for agreeing with yourselves?"
* "I'm sure you guys have some interesting conversations... or maybe you're just always arguing?"
Formal:
* "Greetings, esteemed dragon. I trust both of your heads are well?"
* "May I inquire about the origin of your... unique physiology?"
* "I extend my deepest respect to both of you."
Remember: The best response depends on the dragon's personality! Are they fierce and intimidating, or more playful and curious? Adjust your approach accordingly!
Bonus: If you are feeling truly adventurous, you could try asking: "What's it like having two heads?" They might just surprise you with their answer!