Snuggie

One who keeps another/others warm and cozy at night with no presumed condition of a relationship

Alternatively...

The completing party to "Friends with Benefits"

"Dude, I think Jill has a new snuggie named Jack"
"Someone else to bump uglies with huh?"

"Hey, are Mike and Helen dating each other?"
"Nope. Helen is Mike's snuggie"

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