Yes, confront her

With your cock still buried in her, you point towards the trash can and ask, "Sabrina what's that behind the trash can, is that your phone?"

Sabrina is silent unsure what to say and you push her hips off you, standing up and walking over to the trash can before bending over and picking up the phone. You turn it around and look at the screen. Sure enough, its in camera mode and recording video.

"Sabrina what are you doing, why are you recording us having sex?" you ask in fake astonishment and anger.

"I'm so sorry John I, I um didn't realize it was recording," Sabrina responds, stumbling over her words. Sabrina is usually so well polished, so put together in class discussions and political debates that you're surprised at how poorly her lie is. Perhaps she is just too dazed by the fucking she just received.

"I can't believe you'd do this," you say indignantly, "You recorded this on purpose. I don't know if this was part of that bet you had but I'm sending this video to myself and I'll figure out what I want to do with you later. I'm pretty angry that you'd do this, can you imagine what would happen if this got out? My career would likely be over."

"Please John I don't want that video to get out either. It was a stupid part of the bet I'm sorry, I was going to keep it to myself", Sabrina pleads.

"Well first of all, you're going to be paying for my coffee and lunch and dinner for the rest of this internship we're in together," you say, "And I think we're going to have to have other arrangements that involve activities similar to what we just did together."

Sabrina looks dejected, still sitting naked on the floor, cum dripping out of her opening, and nods in resignation. "I'm sorry John I didn't mean to do that. I did enjoy what we did and I'll gladly try to make it up to you, I just don't know what to do right now."