Fluffs, the team had discovered, were somewhat empathic. In the absence of other Fluffs, to be healthy, happy and well-adjusted, a Fluff needed to bond with someone of another intelligent species, and since other species weren’t as long-lived as the average Fluff, they tended only to bond with a couple or a family unit. That provided stability through generations of the same family.
Although Nosy loved all the team, from the moment it had met them, Jack and Ianto had become its chosen family.
Ianto said it was like having a small child and a large dog rolled into one.