Guy stalks and kidnaps her. Takes her to bunker under his garage(?) Turns her into a sex slave with orgasms.
Girl asks him to get her sister.
He gives sister (Amber?) a letter, and sister goes with him.
Later, Mom is captured, and broken, as Mom was thetrue evil one in the story.
I keep thinking it's a Vulgus story, but I can't find it on his page