Supernatural - Castiel/Dean
Castiel had seen wonders of creation beyond the capacity of human language. Enochian was far better although he could share thoughts and feelings with his brothers and sisters, explain ideas without words. He missed that.
He had thought nothing could surprise or impress him any more. A single human had changed all that. Dean Winchester continued to present Castiel with new options, new avenues he had never contemplated. He saw possibilities where Castiel perceived only predetermination. He retained resilience beyond the demonstrated capacity of his species.
Most surprising were his eyes, where Castiel discovered a realm of greens beyond comprehension.