cozy

Short definition from Wiktionary

Adjective

1. 1
   Affording comfort and warmth; snug; social and comfortable.
2. 2
   Warm and comfortable.

Noun

1. 1
   A padded or knit covering put on an item to keep it warm, especially a teapot or egg.
2. 2
   A padded or knit covering for any item (often an electronic device such as a laptop computer).
3. 3
   A work of crime fiction in which sex and violence are downplayed or treated humorously, and the crime and detection take place in a small, socially intimate community.

Verb

1. 1
   To become snug and comfortable.
2. 2
   To become friendly with.