A possible plot twist is that Piper's pregnancy affects her powers in unexpected ways. For example, her ability to freeze time might start to act up and freeze random things or people that she doesn't intend to. And perhaps Chris has a connection to an old enemy that resurfaces because of the pregnancy, putting Piper and the baby in danger.
Well, it could be about Piper accidentally using her powers in a way that physically or emotionally harms Chris. Maybe in a moment of anger or misjudgment. For example, if she's trying to protect someone else and doesn't realize Chris is in the line of fire. Another possibility is that Piper's actions in a spell gone wrong end up causing trouble for Chris.
The Source of All Evil could be a potential villain. It might see Piper's unborn child as a threat to its power and plan to either corrupt the baby or stop the pregnancy. Another could be some rogue warlocks who want to use the baby's power for their own evil purposes.
If Piper hurts Chris, it would surely create a rift in the family dynamics. The Halliwell sisters would be caught in the middle, having to deal with Piper's actions and also help Chris. It could also lead to a change in Piper's character arc, as she'd have to come to terms with what she's done.
One popular Piper pregnant fanfiction might be found on FanFiction.net. You could search for stories that focus on Piper's pregnancy and how it affects her powers and relationships within the Charmed universe. Another place to look is Archive of Our Own (AO3). There are often many creative takes on this scenario in the Charmed fandom there.
Common themes in 'Charmed Piper Chris fanfic' include growth. Chris is growing up and Piper is also evolving as a character. Fanfics might show how they help each other grow. Forgiveness is also a theme. Maybe Chris makes a mistake in the past or future and Piper has to forgive him. Or vice versa. And then there's the theme of legacy. Piper has a certain legacy as a Charmed One, and Chris is part of that legacy too. Fanfics can explore how they uphold or change that legacy through their actions.
One frequent theme in Piper pregnant fanfiction is the fear of the unknown. Piper is likely to be worried about how her pregnancy will progress, especially considering her magical nature. Will the baby be normal? Will her powers affect the baby? Writers often delve into these insecurities. Also, the theme of new beginnings is quite common. The pregnancy represents a new chapter in Piper's life, and fanfictions may explore how she embraces this change. There could be a lot of character growth as she prepares to become a mother. She might learn more about herself and her capabilities, not just as a witch but also as a future mother.
Well, perhaps it could involve Chris falling for a witch from another coven. They meet during a magical gathering and are instantly drawn to each other. Their love story might be filled with challenges like having to keep their relationship a secret from their respective covens at first because of some old feuds or rules.
One possible plot could be that the sisters are on a normal day in the manor when they suddenly sense a strange magical presence. Following it, they find baby Chris. They then have to figure out who he is and why he's there. Maybe they discover he's from the future and they need to protect him from some dark forces that are after him in his own time.
One popular 'Charmed Piper Chris fanfic' is 'A Mother's Love'. It beautifully explores the relationship between Piper and Chris, delving into the mother - son dynamic in a way that's both heartwarming and full of magical charm. Another great one might be 'Chris's Journey'. It shows Chris's growth and how Piper influences his path. There are also fanfics that focus on their adventures together in the magical world of 'Charmed', which are really exciting to read.
One possible plot could be Phoebe discovers she's pregnant and tries to keep it a secret from the magical community at first because she fears for the baby's safety. But as her pregnancy progresses, strange things start to happen, and she realizes she needs the help of her sisters.