It's important to address this situation with sensitivity and care, as it involves a sensitive topic. It's commendable that you took your friend's statement seriously and tried to protect his nieces. However, it is also essential to approach such matters responsibly and involve appropriate authorities when necessary.
If your friend expressed that he finds young girls attractive, it could be a concerning statement that may warrant professional intervention. Attraction towards minors is a serious issue that needs to be handled responsibly and with the appropriate authorities, such as law enforcement or mental health professionals.
While you had good intentions in sharing this information with his sister, it might have been more appropriate to speak to a trusted adult or the authorities about the matter. Your friend's reaction of not wanting to talk to you might be due to feeling embarrassed, upset, or overwhelmed with the situation.
In these situations, it's essential to prioritize the safety and well-being of the children involved. If you feel uncertain about how to proceed, consider seeking advice from a counselor or a professional who can guide you through the right steps to ensure the safety of the children and your friend.
Remember, your intent was to protect children, and that comes from a place of concern and care. Nonetheless, to prevent further harm or misunderstandings, it's essential to handle such delicate issues responsibly and confidentially.