How did hades and Persephone become a couple?

Hades asked his brother Zeus if he could have Persephone for his bride, to this Zeus agreed without consulting Demeter or Persephone

• Hades than took her, and Demeter showed her wrath until she got

her daughter back, except Persephone had eaten of the pomegranate and had to return to Hades for half the year, this causes Demeter to make the land cold and barren (i.e. winter). Persephone return brings about spring.