The prompt was something along the lines of 'Carol's ex-boyfriend stops when he's in town after Carol and Burt are married and stays the night at the house. Finn loves him. The next day he's gone, leaving early. A few days later he breaks into the house and Kurt is the only one there, and he rapes him. Carol blames herself for bringing the man into the house.'
Something like that, it was awesome and I'd bear your Internet babies if you know of it and could lead me back to it! :)