I'm not sure what specific 'BJ' means in this context. If 'BJ' stands for Beijing, here is a story. There were two sisters in Beijing. The older sister was very kind and hard - working. She worked part - time while studying to support her younger sister's education. They often shared their dreams and supported each other through difficulties in the big city.
Well, if 'BJ' means 'Best Journey', it could be a story where two sisters went on an amazing journey together. They explored new places, met different people, and had all sorts of adventures. Along the way, they learned more about each other and their relationship became even closer.
There's really not enough information in the title 'little sister empties balls bj story' to accurately determine what the story is about. It could be part of a creative writing exercise where the words have a very unique and personal meaning to the author. It might also be a mis - named or mis - remembered story title. Without further details, we can only wonder what it could be.
Since the terms are rather ambiguous, it's difficult to say what this story entails. 'Big brothers' might imply siblings, 'baby juice' could be something related to a baby's drink in a story about taking care of a baby perhaps, and'sister' is another family - related term. However, without more context, the overall 'big brothers baby juice sister bj story' remains a mystery.
Since the 'bj' in your title seems out of place and not clear in relation to the 'little sister swallows seed' part, I'll focus on the main part. It could be that the little sister swallowing the seed is a key event in a story about a family. Maybe it causes worry among her family members, and they have to figure out what to do, like whether to take her to a doctor or wait to see if it passes naturally.
If this is a non - inappropriate story, perhaps the 'trick' could be a misunderstanding. For example, the little sister might be tricked into believing she's going to a fun party but ends up at a boring family gathering. It could be about how she overcomes the disappointment and finds something positive in the situation.