Lucifer is dead. There is not denying it. It's just a fact of life or rather lack there of. He isn't come back. There is not going to be some miracle. Just deal with. 
Lucifer is stuck in limbo not able to go anywhere. He is bored out out of his mind and just hoping it will end. One day he meets an old man who has the power to send him to the after life. Lucifer would do anything for this chance. The old man tell Lucifer that in order to move on to the after he must rescue the old mans lost love from hell. Lucifer agrees not knowing what he is getting him self into. Hell is nothing like he imagined. It brings new meaning to the phrase when hell freezes over, and Satan is really a hot girl who won't stop flirting with him, and worst the part is if die again in hell he will have to stay there.