I want you to be my wife, as the queen of the underworld.
I do not approve of this!
Hades, the god of the underworld, saw that there was a young girl with youth and he thought that she would be perfect for him as his wife and to be the queen of the underworld, so he went to the surface and snatched her down into his kingdom super fast.
Persephone was wondering what she was doing there and Hades told her that he wanted her to be his wife and being his wife would make her the queen of the underworld, some of the gods on Mount Olympus thought that it would be great if she was the queen.
You can not marry her without my permission!
Demeter although, thought that Hades was not the correct husband for her daughter and she was furious that Hades went on asking her even though she did not give her approval.
How about for half of the months, she spends time with Hades, and the other half with you!
After Demeter left to go face Hades in the underworld she was in charge of making sure that it is the right conditions to make plants and food, but when she left she was not watching Earth so all the plants died and it was cold.
Why are all my plants dying?!
When she was in the underworld, Hades and herself were having a huge argument on how even though Demeter does not want Hades to marry her Hades does what he feels is right and decides to still asked her to marry him.
Well I can do whatever I want!
Zeus was on Mount Olympus and he decided that it was enough, and he came down to the underworld and told them that she could not spend time with both of them at the exact same time so they made a deal where for half of the year she goes with Hades and the other half is with Demeter, and people say when she is with Hades is when it is winter and when she is with demeter it is when it is summer.