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"Let's keep it between us / among us."

This is not idiomatic. This is preposterous to the natives. Usual grammatical rule is not applicable here.

Instead, one should say :

Let's keep it between you and me.

Let's keep it between you and us.

Let's keep it between ourselves.

[ BETWEEN OURSELVES : (AmE.) = 'between you and me', meaning : 'instead confidence', 'as a secret'. Source : Collins Dictionary ]

"Let's keep it between us / among us."

This is not idiomatic. This is preposterous to the natives. Usual grammatical rule is not applicable here.

Instead, one should say :

Let's keep it between you and me.

Let's keep it between you and us.

Let's keep it between ourselves.

[ BETWEEN OURSELVES : (AmE.) = 'between you and me', meaning : 'in confidence', 'as a secret'. Source : Collins Dictionary ]

"Let's keep it between us / among us."

This is not idiomatic. This is preposterous to the natives. Usual grammatical rule is not applicable here.

Instead, one should say :

Let's keep it between you and me. Let's keep it between you and us. Let's keep it between ourselves. [OURSELVES : AmE, , meaning 'between you and me', Collins Dictionary ]

"Let's keep it between us / among us."

This is not idiomatic. This is preposterous to the natives. Usual grammatical rule is not applicable here.

Instead, one should say :

Let's keep it between you and me.

Let's keep it between you and us.

Let's keep it between ourselves.

[ BETWEEN OURSELVES : (AmE.) = 'between you and me', meaning : 'instead confidence', 'as a secret'. Source : Collins Dictionary ]

Traditionally, it is said that 'between' is used in the case of two persons or things; 'among' is used in the case of more than two persons or things. But this is absolutely wrong. Now, let's discuss it in the light of proper grammatical rule:

If you want to keep some secret within several distinct number (two, three, etc.) of people, use 'between' :

• Let's keep it between two of us. (Correct)

• Let's keep it between you and me. (Correct)

• Let's keep it between us. (Incorrect).

[ Because, here, the pronoun 'us' refers to several indistinct number of people. So, 'between' should not be used.]

If you want to keep some secret within several indistinct number of people, i.e., within a group, a crowd or a mass of people, in which the exact number of people is unknown or not clear, you may say :

• Let's keep it among us. (Correct)

[ Here, the exact number of people is not clear here. So, 'among' has been used. ]

"Let's keep it between us / among us."

This is not idiomatic. This is preposterous to the natives. Usual grammatical rule is not applicable here.

Instead, one should say :

Let's keep it between you and me. Let's keep it between you and us. Let's keep it between ourselves. [OURSELVES : AmE, , meaning 'between you and me', Collins Dictionary ]