不分彼此

bùfēnbǐcǐ
  1. to make no distinction between what's one's own and what's another's (idiom)
  2. to share everything
  3. to be on very intimate terms

CEDICT

to share everything; to be on very intimate terms

Wiktionary

  1. 比喻感情非常亲密。
  2. 同心合力。

重編國語辭典

Entry Composition

1 不分 bùfēn
  1. not to distinguish; to make no distinction
  2. (LGBT slang) versatile (open to either penetrative or receptive role)
2 彼此 bǐcǐ each other; one another