"nested" in the verb sense
inhabit a nest, usually after building
"birds are nesting outside my window every Spring"
fit together or fit inside
3. cuddle, snuggle, nestle, nest, nuzzle, draw close
move or arrange oneself in a comfortable and cozy position
"We cuddled against each other to keep warm"
"The children snuggled into their sleeping bags"
Source: WordNet® (An amazing lexical database of English)
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