curled around these images

I think there are times when the term fits them quite well (as defined as psychologically addicted), but then we'll see examples of that not being the case. Though, in those examples (Sam in the pit and Dean in purgatory), it's usually used to show us their need to be back together or how their separation fails in some way. That's more to do with necessity of story telling I know, but I think there is also an attempt to give us reasons why they seem to have trouble being apart.