Nana, who is a strong - willed and passionate woman, especially when it comes to music. Takumi, who is a bit of a mystery in terms of his true feelings but is very involved in the music industry. And the baby, which is the new element in their lives that changes the dynamics. In this fanfiction, these three are the key players around which the story revolves.
You can find 'nana x takumi fanfiction' on various fanfiction websites such as Archive of Our Own (AO3). It has a large collection of fan - made stories, and you can easily search for 'nana x takumi' there. Another place is FanFiction.net. There are many fans who post their creative works about this pairing on these platforms.
Perhaps the baby has some sort of special talent or characteristic that draws Nana and Takumi closer together. It could be that the baby is musically inclined like them, and they bond over nurturing this talent in the child. This could also lead to new opportunities for both of them in the music world.
There are several notable 'nana x takumi fanfiction' out there. For instance, 'Nana's Perspective' offers a unique view of their relationship from Nana's point of view. It really allows readers to understand her thoughts and feelings towards Takumi better. 'Takumi's Struggle' is another one that shows Takumi's internal conflict when it comes to his relationship with Nana. And 'Reimagining Nana x Takumi' is a story that takes the basic elements of their relationship and reimagines it in a completely new and exciting way.
To be honest, I don't have the exact count of how many Nana manga there are. It's best to refer to official manga sources or dedicated manga communities where you can get a clear and up-to-date number.