Elusive ending for my Slashy Valentine

I am almost done with my story! I see the light at the end of that tunnel but it is flickering and I am trying to figure out how best to end the story. I feel like I could keep writing and writing and it would never end. There does not seem to be a good ending point. I hope it will just occur to me sometime. I don't really have a plan for the ending so that is where the problem is. Blah.