Did I do the right thing?

Micael
Ok so my niece is 17 years old. & we've always been really close. She came to me and told me her boyfriend wants her to send him nudes, she wants to but she's hesitant. I told her it was up to her but she should definitely not show her face  Idk if I should tell my sister or keep it to myself . I don't want to tell her not to do it because I did it too when I was her age so I don't want to be hypercritical.  

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