I started reading the story on fanfiction.net but haven't been able to find it again.
The story takes place well into the future. Kurt and Blaine are married and have a teenage daughter. She is dating this guy wo turns out to be Karofsky's son. She ends up pregnant.
What Blaine only finds out recently is that Karofsky raped Kurt back in high school. Kurt goes to the police and Karofsky is arrested.
Can anybody help me please.
Thanks so much.
EDIT: Found thanks to julieliveshere. link in comments.