Ensio was the first to join Lycka, after he was abandoned by his small pack because of his anxious demeanour and aversion to aggression, they saw him as a weak link. He feels grateful to his leader for taking him in, and likely saving him because he didn't know how to survive on his own.
When Bee joined the pack, he gravitated towards her friendly, self assured personality and the two of them bonded well, having two pups and he wants to eventually ask her to be his mate.