A complete speaking model
If friends pressure me to share an embarrassing image, I can say, I do not want to post someone’s photo without permission. I can leave the conversation and seek support if pressure continues. Although I may feel anxious, joining in could harm another person. A trusted adult can help; refusing does not mean I must solve the whole situation alone. I would not forward the image to prove to more classmates that it exists. Relevant evidence should be preserved safely and reported through an appropriate school or platform route. If there is an immediate threat, safety takes priority over keeping a secret. Our classroom discussion should use fictional cases, not require anybody to describe a personal experience. A good response protects the affected person instead of creating another public audience for the harm.
Follow-up: Does supporting a friend mean promising total secrecy?
Response: No. Explain that trusted adult help may be needed if someone is unsafe.