"Left her to be trusted till the orphan bleeds" likely means that Salty (her brother most likely) was entrusted with raising her until she was old enough to look after herself. Think of a girl reaching menarche as now being a woman, and therefore old enough to do what she wants. "Cunning" definitely would be a play on "cunny," meaning that sex is the only thing that brings men to her, and by connection the only way she is able to feel wanted or loved. I think it's very likely that the song is supposed to be sung from the perspective of the girl's child, who is asking his Uncle Salty (his mother's brother) what happened to his mother. The "sunny day outside my window" refers to the fact that even though there's a beautiful world out there, he feels trapped behind glass, unable to properly enjoy life, only able to watch others enjoy it.
"Left her to be trusted till the orphan bleeds" likely means that Salty (her brother most likely) was entrusted with raising her until she was old enough to look after herself. Think of a girl reaching menarche as now being a woman, and therefore old enough to do what she wants. "Cunning" definitely would be a play on "cunny," meaning that sex is the only thing that brings men to her, and by connection the only way she is able to feel wanted or loved. I think it's very likely that the song is supposed to be sung from the perspective of the girl's child, who is asking his Uncle Salty (his mother's brother) what happened to his mother. The "sunny day outside my window" refers to the fact that even though there's a beautiful world out there, he feels trapped behind glass, unable to properly enjoy life, only able to watch others enjoy it.