Another possibility is that Sakura is struggling with her self - esteem. She might be comparing herself to others in her ninja class and feeling inadequate. She hides this pain by acting overly confident, but inside she's really hurting. She could be constantly pushing herself to be better, all while hiding the fact that she feels like she'll never measure up.
Perhaps Sakura is dealing with family issues. She could be hiding the pain of having a difficult family situation, like an overbearing parent or a family member with an illness. In the fanfiction, she might focus on her school or ninja work to distract herself from her family problems.
Maybe Sakura is afraid of the reaction from her friends or family. So she decides to keep her pregnancy a secret at first. She might be worried about how people will judge her, especially if she's in a difficult situation like not being in a stable relationship.
One character could be Naruto. He might be Sakura's friend, but completely oblivious to her hidden pain. He's so focused on his own goals that he doesn't notice Sakura's struggle, which could add to her feelings of loneliness.
One possible plot could be that Bella is afraid to speak out about the abuse due to threats from the abuser. So she hides it from her friends and family, trying to act normal while suffering in silence.
A common plot device is the 'big reveal'. Sakura's true strength is suddenly shown in a moment of great need, like when her friends are in extreme danger. This creates a dramatic effect and often turns the tide of the story.
In this fanfiction plot, Sakura could be on a mission to infiltrate Pain's group. However, during her time there, she gets to know Pain on a deeper level. They start to bond over shared experiences of loss and the desire for a better world. Their relationship then becomes a catalyst for change. Sakura tries to bring Pain to the side of good, and together they face many obstacles, both from the Akatsuki and from Konoha, as they try to navigate their new - found love within the context of the Naruto - like world.
It could be about a very dark and twisted situation where 'pain' is personified and is physically restraining or harming'sakura' in some way. Maybe it's a psychological horror story where sakura is a victim of some malevolent force represented by 'pain'.
Maybe Naruto hides his genius to avoid unwanted attention. He might be afraid of being targeted by enemies or those who would use his abilities for bad. For example, in the original series, he already had a lot of people after him because of the Nine - Tails. By hiding his genius, he could be trying to keep a low profile and train in secret to become even stronger without interference.
Well, one possibility could be that Naruto is hiding his true identity or emotions. Maybe he's on a secret mission and the mask helps him blend in or deceive the enemy. He could be using it as a form of protection, not just physically but also emotionally.
Perhaps in this fanfiction, Harry hides behind a mask because he wants to experience life in a different way. He might be tired of all the expectations that come with being Harry Potter. By wearing the mask, he can interact with people without them knowing who he really is, and he could discover new things about the wizarding society and its inhabitants. He could also be using the mask as a form of self - discovery, to find out who he is when he's not 'Harry Potter'.
Her closest friend might help her. Someone who really understands her and is willing to keep her secret. For example, Ino could be that friend. Ino has always been there for Sakura in the original story, so she could be the one to support Sakura during this difficult time.