There might be a story where the big sister stands up for her little brother at school. When some kids are picking on him, she uses her wits and courage to make them stop, showing her protective side.
Sure. For example, the big sister might help the little brother with his homework. She explains difficult concepts to him in a way he can understand.
One 'little brother big sister story' could be about how the big sister always protects her little brother from bullies at school. She stands up to the mean kids and makes sure her brother feels safe.
One 'big brother big sister story' could be about a big brother teaching his little sister how to ride a bike. He patiently held the bike while she pedaled, and when she finally rode on her own, it was a really heartwarming moment.
One interesting sister and big brother story could be when the big brother taught his sister how to ride a bike. He patiently ran beside her, holding the seat, until she got the hang of it.
One 'brother big sister story' could be about how the big sister always protects her younger brother from bullies at school. She stands up for him and teaches him how to be brave.
One popular 'big brother little sister fanfiction' could be those that focus on the protective nature of the big brother. For example, in some stories, the big brother might defend his little sister from bullies at school. Another type could be about their adventures together, like exploring an old, mysterious forest near their home.
One idea could be that Big Brother is a protector in the BioShock world, guiding Little Sister through the dangerous and strange underwater city. He helps her avoid the Splicers and find the ADAM she needs in a more ethical way, like by using his combat skills to take out the Big Daddies first so she can harvest safely.
In a story, the little sister might be in charge of deciding what the family has for dinner when the parents are out. She forces her older brother to help her cook her favorite meal by threatening to tell their parents he was mean to her earlier. She bosses him around in the kitchen, making him do all the chopping and stirring while she supervises.
Here's an interesting one. The little sister was sissy in that she was afraid of heights. The older brother wanted to help her overcome this fear. He took her to a small cliff and climbed down first, then called her to follow. He supported her all the way, and after that, she was less afraid of heights. This story shows the bond between them.
One story could be that the older brother ate the last piece of cake that was meant for their mother's birthday. So, the little sister made him clean the whole kitchen as punishment. She supervised him closely, making sure he scrubbed every corner of the counter and washed all the dishes thoroughly.