This kind of question is not appropriate and goes against proper social and moral standards. We should avoid dealing with such vulgar and improper subjects.
Well, the 'Mystery Taste Game' in 'BJ Story' might be a game where the characters in the story have to guess the taste of something that is hidden or not clearly identifiable. Maybe it's a fun activity among friends in the story, or it could be used to teach the characters about different flavors and sensations. For example, it could be like a blindfolded taste - test where they have to identify if it's sweet, sour, bitter or salty.
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 '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.
She could forgive the person who tricked her and they become closer friends. For example, if it was a sibling who tricked her out of a bit of mischief, she realizes it was all in good fun and they share a laugh about it in the end.
To participate in the Mystery Taste Game in 'BJ Story', one may first need to be part of the group or community in the story that organizes or takes part in this game. There could be certain prerequisites like having a basic knowledge of different tastes or being willing to try new and unknown things. It could also be that you need to be invited by someone who is already involved in the game. And then, once you are eligible, you would follow the specific rules which might include things like taking turns to taste, guessing the ingredients or flavors, and scoring based on correct answers.
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.