Lydia came to smile at the mention of fizzy drinks. "What's that?" She asked and once he introduced himself she lifted a brow. "The Doctor?" She said as she came to tilt her head. But soon green hues looked between Cas and the Doctor for the moment. So, he wasn't human. Apparently, none of them were.
Slowly her hand raised as to say something. "So. To break this awkwardness in the future I'll start. Lydia Martin. Banshee." She said as she took the bag of white fluff and pulled it open as she popped one into her mouth and smiled between the two men.