You can't get blood out of a stone

Blood From a Stone,

He swayed side-to-side, fighting against my compulsion.   I smiled sweetly, leaning in and grazing my nail across his cheek. “You understand?” Skin contact made it solid. His shock melted into a gooey grin.

J.M. Friedman. Succubus in Seattle (Kindle Locations 173-175).

You can't get blood out of a turnip

Sweating blood

Maxine wouldn’t appreciate a visit from a succubus, especially one being tracked by a detective. But I didn’t have a choice. I needed help. Even if that meant getting help from a nun.

J.M. Friedman. Succubus in Seattle (Kindle Locations 193-194).