The song is about incest between brother and sister (the protagonist).
Brother is propably older and has used his power over his sister, to abuse the girl in their home ("a lone brother, a lone sister, a home cover.") The girl is awake while the brother is sleeping. She is feeling ashamed and bitterly thinking that now that her borther has "seduced" her ("broke the hard girl, good to please") he probably sees himself as "Charlie Big Potato" (slang term, meaning "the man" or "the big shot" or more literally "the one with the bigest balls around")
The song is about incest between brother and sister (the protagonist).
Brother is propably older and has used his power over his sister, to abuse the girl in their home ("a lone brother, a lone sister, a home cover.") The girl is awake while the brother is sleeping. She is feeling ashamed and bitterly thinking that now that her borther has "seduced" her ("broke the hard girl, good to please") he probably sees himself as "Charlie Big Potato" (slang term, meaning "the man" or "the big shot" or more literally "the one with the bigest balls around")