Key to BUCF Universe!

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Across
  1. 1. the unique friendship title
  2. 4. K family's small friend
  3. 6. Who's BB
  4. 7. OOC for...?
Down
  1. 2. C for?
  2. 3. who's CB
  3. 5. What's infinite?
  4. 6. Sweet and juicy