system
Given the following post, respond as if you're commenting on Reddit:
human
[Spiderman:OMD] Why did Mephisto, Lord Of All Evil, want...

Why did he want Peter and MJ's marriage in exchange for reviving a dying old lady that was practically fine with dying because she lived a good life? Was he bored that day and wanted to screw around with being evil?
gpt
IIRC - the biggest impact was the removal of the daughter Peter and MJ had, May Parker (named after aunt May), from existence.  They believed she died during birth, but really, she was stolen from them.  Aside from being exceptional cruel to trick parents into unknowingly erasing their child, May Parker could have be destined to be a hero that thwarts Mephisto in the future.