"Felicity, this is Jacob, my wolf. Jake, this is Felicity."

The way Jake looks at Elspeth would make it pretty obvious he was her wolf even if Felicity had not been previously introduced to the concept.

"Hi, Felicity," says Jake. "Huh, this one's not white."

"He is not," agrees Elspeth. "Just barely not the first discovered case - the elf Sandy looks Asian, I'm not sure what the equivalent phenotype in Thilanushinyel is called."

"Huh," says Jake.