The little sister can feminize her older brother through role - playing games. Suppose she wants to play a family game where she is the mother and she convinces her brother to be the daughter. He has to act like a girl in this role - play, wearing girl - like clothes she provides and doing 'female' chores in the game. This is a clear way of feminizing the older brother in the story.
She can feminize him by sharing her hobbies. For instance, if she likes dancing ballet, she can teach her brother some basic ballet moves. Ballet is often considered a feminine activity, and when the brother tries it, he is being feminized in the story. It shows him participating in something that is not typically associated with boys.
In some cases in a story, it might be shown as appropriate within the context of teaching the little brother a lesson about misbehavior, like if he has been repeatedly naughty and she has tried other methods first. However, in real - life, physical punishment is not always the best approach.
In general, as children grow up, there should be a proper sense of privacy. While at a very young age, it might be acceptable for an older sister to assist briefly under parental supervision, but as they get older, it should be avoided to respect their individual privacy.
This is a rather unusual situation in most cultures. However, in a make - believe or very young children's play scenario, one could imagine a story where a little brother, perhaps in a game of 'pretend family', tries to diaper his older sister's doll as if it were his sister. But in real - life, this goes against typical social norms.
In some family - centered stories, the little sister is really into girly things like tea parties. She convinces her older brother to participate. She makes him wear a crown and a cape, and they have a 'royal' tea party. Through this, the brother is feminized as he takes part in an activity that is often seen as more suitable for girls. He might even start to enjoy it and become more open to 'feminine' activities in general.
One reason could be that the little brother has been disobedient. For instance, if he was told not to play with a certain dangerous item but did it anyway. Another reason might be that he has been unkind to others, like bullying a younger sibling or a neighbor kid, and the sister feels it's her responsibility to correct his behavior.
Age is the first thing to consider. If the little brother is too young to take a shower independently, the older sister can help, but if he is old enough to have a sense of privacy, it's not appropriate. Also, safety should be ensured during the shower process.
One story could be that the older brother is always late for school. The little sister, who is very punctual, makes a schedule for him and strictly enforces it. Every morning, she wakes him up early and checks if he has completed all his preparations. If he tries to be lazy, she scolds him gently but firmly.
There was a time when the little sister knew her older brother was shy. So, during family gatherings, she would tell embarrassing stories about him in front of everyone. She thought it was funny, but it really made the brother uncomfortable. This is a way she bullied him, by intentionally making him feel awkward in social situations.
Well, in one story, the little sister was really into dancing but was shy. Her older brother, who was quite popular, encouraged her. He even made a small stage in their backyard for her to practice. And he would be her first audience, giving her confidence to perform in front of others.
One possible story could be about a little sister who is very bossy towards her older brother. For example, she might make him do her chores by using her charm and a bit of trickery. She convinces him that it's his role to help her out all the time.