secret love letter

Letters containing poems or expressions of love, and are not known by other people except the recievers mother.
Reciever is often a girl.

Secret love letters written by a girl are often not sent, and are not known by other people except the girl's mother or/and sister(s).

I sent a secret love letter to a girl (I'm a guy). Nobody knows about it.

I wrote a secret love letter to a boy (I'm a girl). I never sent it.

18👍 2👎