Spider-Man - One More Day

Spider-Man: One More Day is a 4-part, 2007 comic book crossover storyline, connecting all of the Spider-Man comic book series. It concludes the storyline of the fallout of Spider-Man's actions during the Civil War. It starts in Amazing Spider-Man #544, continues in Friendly Neighborhood Spider-Man #24 and The Sensational Spider-Man (vol. 2) #41, and concludes in Amazing Spider-Man #545.

With Aunt May, accidentally shot by a sniper during the closing hours of the Superhero Civil War, in dire condition, Peter is forced to ask Tony Stark for financial assistance. He listens to Peter, but tells him he can't help him, because he is a wanted criminal, and leaves. He does however send Jarvis to the hospital, with a $2,000,000 check that will cover May's medical needs. Peter then sets out to help May, any way he can.

Spiderman eventually encounters Mephisto, who tells Peter he can save Aunt May. But as payment, Mephisto wants, not Peter's soul, but his and Mary Jane's marriage. In return for saving May, he wants to wipe all memory of Peter's marriage to MJ from all but one part of his soul, and vice-versa, so that he may listen to those parts' pain for the rest of eternity. Peter and Mary Jane are given until midnight the following night to decide their answer.

http://en.wikipedia.org/wiki/One_More_Day_%28comics%29