She panics

You have barely put your phone back into your pocket when it vibrates. You pull it back out - sure enough you've gotten a text back from Sabrina.

Her: Hey, who is this?

You: Don't worry about who I am. You should worry about what happens if people know about your hobby.

Her: Why did you send me this? This isn't me.

You: I know its you Sabrina, don't lie to me or there will be consequences.

Her: It's not me. Is this some sort of prank? Who is this?

You: Try one more time and I won't be happy.

There's a long pause after you send the last text. You're sure Sabrina's head is spinning, wherever she is, trying to weigh the consequences and what to do next. A couple minutes later, you get a response, and its the one you'd been hoping for.
__

Her: I'm so sorry. I didn't mean to lie to you. I'm just worried. I really don't want anyone to know about this.

You: It's too late now, I know the page is you and I've saved all the photos and videos already. Don't try taking down your page or I will make sure everyone you know finds out. What you can do now is play along and prevent this from getting worse.

Her: Are you blackmailing me?

You: You can call it whatever you want.

Her: Please, what can I do so you won't tell anyone? I'll do anything.

You: Anything?

Her: Um, sorry please don't take that literally. I meant I'll do anything reasonable, do you want money or something? Or a split of what I get from the site?