Miller's wife from Acorn water
The miller's wife from Acorn water is the wife of the miller of Acorn Water near Winterfell. She had soft pillowy breasts, stretchmarks on her body a sweet mouth and a merry laugh. Theon Greyjoy slept with her once or twice, and thinks there was nothing special about her.
A Clash of Kings
When Theon Greyjoy captures Winterfell, Bran and Rickon hide in the crypts. To hide the truth of their escape, Theon goes to Acorn Water mill and kills the miller's two children. Gelmarr cuts the millers wife down with one blow of his axe, while she begs Theon for mercy. The dead children are skinned by "Reek" and Theon proclaims them to be Bran and Rickon.
Theon later has a nightmare that he is in bed with the miller's wife again, but she has teeth both above and below and she tears out his throat even as she is gnawing off his manhood.
A Dance with Dragons
Theon argues with Rowan that he is no kinslayer. He thinks to himself that the two children he killed were just some miller's sons, and that he had known the miller's wife for years. He remembers that she had big heavy breasts with wide dark nipples, a sweet mouth, a merry laugh - joys that he will never taste again.