Bargaining by protagonist
http://archiveofourown.org/works/1108212

Awesome story I love a good time travel story and this one is something else. How many people think "if only" in this case it's Loki. He answers a summons from Jane only to find that Thor is dead. He can't handle it especially since there is no one to blame. No one comes forward to take credit for his murder. No matter how hard he attacked Thor he was not supposed to die and the fact it was at another's hand is even worse. He finds a way but there is a heavy price, his life and future, in addition if anyone finds out it will all go back to the previous timeline. But he is no coward and his life has always revolved around Thor as if he was his sun without him there is no point. He goes back further then he thought and begins to try and ensure that Frigga and Thor survive. There are twists and turns as Loki is forced to take a hard look at his life. While there is some fairly emotional and angsty moments there is a lot of action and humor because fate loves laughing at people. Poor Loki. The author has a good handle on Loki’s character as well Odin. The flashbacks give the reader the basics of what happened and the more you learn the more you realize just how much Loki lost his mind.