What could be the plot of a 'big brother tickles little sister fanfic'?

No, it might not be appropriate for all ages. If the description of the tickling gets too intense or is written in a way that could be misconstrued as something inappropriate, then it's not suitable for younger audiences. For example, if there are overly suggestive remarks or actions during the tickling scenes.

The plot could be that the little sister was always looked after by the big brother. But as she grows, she becomes more independent and starts to outshine him in various aspects like academics or sports. For example, she might win a big academic award while the brother struggles. Eventually, the brother has to come to terms with his sister's growth and they develop a new, more equal relationship.

One plot idea could be that the brother tickles the sister as a way to cheer her up after she has a bad day at school. Maybe she failed a test or had an argument with a friend, and the brother uses tickling as a light - hearted way to make her laugh. Another could be during a family game night, as part of the fun and games, the brother tickles the sister when she's being a bit too competitive.

It's not a very common or mainstream genre. Fanfiction often focuses on romantic or adventure - based themes between characters. The idea of a brother tickling a sister might seem a bit odd or inappropriate for some, and not as likely to be a widely - explored genre compared to things like romantic pairings in a particular fandom.

The Big Brother in Bioshock fanfic is often characterized as strong and fearless. He has a sense of duty towards the Little Sister. For the Little Sister, she is usually depicted as innocent yet with a special power. Her naivete can be both endearing and a liability. For instance, she may not fully understand the danger she's in, which makes the Big Brother's role even more crucial.

The plot could revolve around a power struggle between them. They both have their own strengths and areas of control in Rapture. Maybe Big Brother decides he wants more power and tries to take over Big Sister's territory. This leads to a series of battles and strategic moves as they each try to outwit the other.

One plot could be centered around a family secret. The big sister discovers that she is part of a long line of women who can grow to a giant size. She has to keep it a secret from everyone, including the little sister. However, one day the little sister accidentally finds out. At first, she is scared, but the big sister explains everything. Together, they use the big sister's ability to help their community, like saving it from a flood by building huge dams in her giant form.

The plot might involve a bet. For example, you lost a bet to your boyfriend and the 'punishment' is that he gets to tickle you. But as he does it, he realizes how much he loves seeing you laugh and it becomes a special moment between you two. It could also be a part of a game you two play regularly, which always ends with both of you feeling closer.

No. Such a plot often involves inappropriate and unethical elements. In literature, we should promote positive values like healthy relationships, respect, and equality, rather than this kind of potentially disturbing plot.

One reason could be that the big brother took something that belonged to the little sister, like her toys or snacks. So she got angry and decided to take matters into her own hands.