Severus gets injured in the shrieking shack (his fifth year). While unconscious he witnesses some scenes from his future and realizes becoming a death eater wouldn't bring him power and glory but pain and servitude. He spends the rest of his schooling trying to shape a different future for himself.
It was alright. I kinda despise pregnancy stories, and the second half was a lot about that. Also, I feel that the characters were rather overdone at the beginning, but it does get better further along.