What could be the plot implications in the fanfiction if Harry is not the father to Ginny's baby?

It could be someone Ginny had a past relationship with before Harry. Maybe an old schoolmate or a character from a side plot in the fanfiction.

One possible plot could be that the baby Lily shows signs of having extraordinary magical abilities from a very young age. Harry and Ginny are both proud yet a bit worried about how to guide her. Maybe she accidentally makes things levitate or changes the color of her nursery walls with her magic. They start to introduce her to the wizarding world gently, taking her to visit Hagrid at Hogwarts. And as she grows, they face challenges from the wizarding community who are either overly curious or a bit envious of the family's status.

One possible plot could be that Harry and Ginny decide to start a family. They might face some initial challenges like finding the perfect time to have a baby. Ginny could be worried about how her career as a Quidditch player might be affected, while Harry is concerned about protecting their future child from any potential dark forces.

One possible plot could be the anticipation and preparation for the baby. Harry and Ginny might be seen discussing names, decorating the nursery. They could also face some challenges like dealing with the media attention, as Harry is famous. Ginny would be experiencing the physical and emotional changes of pregnancy, and Harry would be there to support her every step of the way.

One plot twist could be that Harry is actually protecting Ginny and the real father. He might know some dark secret about the father that would put them in danger if it were known, so he pretends to be in the dark about the situation.

One implication could be a change in their power dynamic. If Ginny is Harry's pet, Harry has a certain level of control over her in the story, which is very different from their equal relationship in the original series.

One possible plot could be that Ginny is hit by a magical spell that turns her into a baby. Her friends then have to figure out how to reverse the spell while taking care of baby Ginny. They might face challenges like finding the right ingredients for an antidote and dealing with Ginny's baby - like needs such as feeding and putting her to sleep.

It could be a story about the baby's special abilities. Since Harry and Ginny are both powerful wizards, their baby might inherit some extraordinary magic. The fanfiction could explore how they discover and help the baby develop these powers, like the baby showing signs of being able to communicate with magical creatures at a very young age.

One possible plot could be that Draco and Ginny initially struggle with their relationship being accepted in the wizarding world. Their baby could be a symbol of hope and change. Maybe the baby has some unique magical abilities that draw the attention of both the good and the bad in the wizarding community. And they have to protect their child while also dealing with their own past differences.

It could be someone completely new, an original character created for the fanfiction. Maybe a mysterious wizard who had a brief encounter with Ginny.