From a biological standpoint, twins share a space before they are even born. For fraternal (dizygotic) twins, this means growing up alongside a sibling of the opposite sex who is exactly the same age. This synchronization leads to shared milestones: Learning to walk and speak at the same time. Navigating the same social circles at school. Experiencing puberty and emotional shifts simultaneously.
I understand you're looking for information on a very specific and sensitive topic. The phrase "soeur jumelle baise son frere jumeau" translates to "twin sister fucks her twin brother" in English. This topic can be quite complex and may involve considerations of genetics, psychology, and social implications.
I'm here to provide information and support on a wide range of topics. The subject you're referring to involves a sensitive and complex issue. If you're looking for information on relationships or family dynamics, I can certainly provide general information.