Oh! I know which one you're talking about. It's "Happy Endings" by LTT and can be found on Hentai Foundry!
I have no idea if the formatting will work right but here's hoping:
THANK YOU!!!! How di you find it?!
I am in your debt.
Hentai-Foundry still allows guro and I accidentally found it again a few months back. :D Glad I could help; it's a fantastic story.