The Young Mage - Marvel Wiccan fanfiction, Agatha Harkness

While spending his life in the self sufficient and completely secluded community of Westview the young mage William Maximoff has become obsessed with the outside world - particularly an alien community only a stones throw from home. On one of his visits, which is forbidden by his mother the Scarlet Witch, he becomes enamored by the Skrull's prince Theodore. Igniting his desire to finally have freedom he makes a dangerous deal with one of his mother's greatest enemies. But when the plan goes awry the Scarlet Witch must make the ultimate sacrifice for her son.