There could also be a powerful, corrupt magical creature as the antagonist. This creature might have some grudge against humans in general or specifically against Harry and Ginny because of their past actions. It could use its magic to make them disappear and keep them trapped in its domain.
One possible plotline could be that they disappear to escape a new dark threat that has emerged in the wizarding world. They might be seeking a powerful magical artifact to defeat this threat and have to go into hiding to find it.
Ginny might support Harry by simply being there for him. In the face of everyone else turning their backs, her presence can be a great comfort. For example, she could sit with him at meals when no one else will.
One possible reason could be miscommunication. Maybe Ginny feels neglected by Harry because he's so caught up in his own heroic deeds and doesn't pay enough attention to her. So she might seek comfort or excitement elsewhere.
It could be that Harry's glasses disappear as a result of a magical experiment gone wrong. For example, Hermione might be trying out a new spell she read about in an ancient book, and it backfires, causing Harry's glasses to vanish. This would create a bit of a rift between them at first, but they would soon realize that they need to work together to reverse the spell and retrieve the glasses.
There could be many interesting fanfictions on this topic. One idea could be that in this fanfiction, the 'force' might be some sort of magical or emotional force that binds Harry and Ginny even closer during her pregnancy. It could explore how they deal with the impending arrival of their baby while also facing challenges related to this special force.
Ginny might initially be heartbroken. She could retreat into herself, feeling betrayed and confused. In some fanfictions, she may cut off all contact with Harry immediately.
Their relationship could become more spiritual. Without the physical limitations and distractions of the living world, they can focus solely on their emotional and mental connection. They might be able to communicate with just a thought and understand each other on a deeper level.
Yes, in many 'Harry and Ginny soul mates fanfiction' stories, their relationship is very well - developed. Writers often take the time to show how they understand each other on a deep level, with shared experiences and emotions that draw them together.