I think you're right, it's about Sofia's visual stimulation of the students, that's what Aiden forces Sofia to do.
But how to show boobs to the whole class? Or will it be a narrow circle, Aiden and Andre?
After all, the phrase, no more than two viewers, has already sounded from the lips of Sofia! It will be very ironic if, because of Sofia's objections, to show her tits to the whole class, Aiden will offer her an alternative, this time to show her tits to only two viewers.
In fact, this is a great progress for Sofia and Aiden can agree that she will show him and Andre her tits, as in the case of showing her panties.
Sofia's thoughts that she shows her tits to two students, and at this moment there is a whole class of students behind her, can excite her. And of course she will be humiliated again.
Is this option possible?
PS In fact, such a development of events is the removal of another taboo for Sofia! After that, it will be easier for her to show her tits to Zach and other students.