I'm not 100% sure, but IIRC, I think in some of the videos the audio (aka the text) was altered to remove names.Nah, if it was, we would have seen it via Sophie's perspective.
Speaking of the computer, Felix almost caught Sophie cheating though. The last video he watched (on the computer), with the "girl" riding Zack. If he would have watched for just a few seconds longer, he would have heard Zack calling Sophie's name and vice versa.
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After all, Zack looks to be intentionally feeding this content to Felix, as evidenced by the BJ video, for example.