Good idea, but the execution was too fast. You should add more struggle and resistance to her. The other TV screen is extremely distracting.
Extending the story: Maybe the guy gets into the video too and transforms into another slut, and while they are enjoying themselves, they start seeing the outer world from the other side of the screen when the guy's friend wonders why the TV is on but nobody is at home. When he picks up the case of the VHS, he will see the two new sluts licking each other on the cover.