I just discovered that my younger sister has a boyfriend. She’s only fifteen, the last-born in our family. I suspected something for a long time but thought I was just being overprotective until my instinct told me to check her phone.

I was shocked when I saw her messages. The boy is in university. They chat on Snapchat more and have exchanged explicit photos. In one chat, the guy said he was with his friends. My sister sent him a n*de photo and wrote, “This is what you’re missing while you’re away. Get in and let’s chat!”

I’m her older sister, and I don’t even know how to use Snapchat. To see a fifteen-year-old handling a relationship more recklessly than I ever have in my life left me stunned. Such dedication and commitment to a boy who clearly has no good intentions toward her.

I sat her down and asked questions. I wanted to know how far things had gone. She told me they haven’t been physically intimate, which I doubt but she said, “I can swear with whatever you want me to swear with. We are just being naughty with words.”

She begged me not to tell our parents, and I know I won’t. I want her to trust me enough to tell me everything. But right now, I’m confused: should I talk her out of the relationship, or should I advise her on safe practices instead?

I feel like she won’t listen if I tell her to leave him. She might say yes but hide the rest from me. To prevent that, I think the best approach is to guide her on what to do and what not to do in relationships at her age.

My question is: where do I start? How do I make her feel safe with me while also ensuring her safety? This girl is slipping away. We often say we’re “in love,” but from what I’ve seen, my sister is sliding and drifting in love. She needs to be saved before things go south.

—Audrey

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