Senna didn't know much about tieflings.  Looking at Ken and then Ignatius, she could only imagine what it was like to have a demonic contract.  But he seemed nice, or at the very least being kindly patient to Senna, so she smiled at him (a dragon's approximation of a smile anyways).
"Alright, Iggy then.  I'll keep the holy water in mind.  I'll probably ask you more questions later, so please continue to have patience with me."

Noticing the conversation between Karu, Anu'din and then Sebastian, Senna had started paying attention.  It seemed like some of her comrades had history, making them seem even more interesting.  What stories they would have! 

Pushing down her excitement, Senna worked at finishing the rest of her meal, planning to go out to buy some vials of holy water.