8 We have a little sister, and her breasts are not yet grown.
What shall we do for our sister on the day she is spoken for?
9 If she is a wall, we will build a tower of silver to protect her.
If she is a door, we will enclose her with panels of cedar.
10 I am a wall and my breasts are like towers.
So I have become in his eyes like one who brings peace.
The text is obviously to be taken metaphorically. But what is its most straightforward allegorical interpretation?
The first verse is pretty simple. The siblings are concerned about their little sister who hasn't yet reached full maturity. They want to find her a suitable mate, but are afraid that no one would want her. The "wall" and "door" that follow have almost unanimously been taken as an allusion to a "virgin" and a "promiscuous woman". But the exchange that follows has yet to be interpreted in a satisfactory manner (If she is a virgin we will protect her with silver, and if she is not, we will protect her with cedar). What are the allusions of the "towers of silver" and "panels of cedar"? Are different actions taken for the "wall" and for the "door"? If yes, what are they?
Furthermore, verse 10 needs to be taken into account as well. If the wall is supposed to symbolize a virgin, then how are we to understand the "breasts like towers" protecting her? Most importantly, how do they relate to verse 8 in which her breasts are said to be not yet fully grown?
p.s. I am not looking for Jewish, Christian or any other religious interpretations, only for scholarly interpretations that take the context of the entire composition into account, and are interested how it was historically understood by the Israelite audience?