Einar will tolerate the head-petting. For a moment. Before pulling back, and slithering back to Loki's shoulder. His inspection is finished--whether he shares any of his thoughts is another matter.

Loki, meanwhile, will reach and offer to pet Marly if the feline would like. "Learning new magic. I plan to be quite diligent in my studies." Especially since this world's native magic was stronger than his own...