Now, just before the update, here's another attempt at speculation about the upcoming event. The last teaser we saw is, roughly estimated, 100 images before the end of this update. It shows a Sophia with the new haircut, nothing sexual.
It seems that the sexual interaction with Claire has already been completed. However, with 100 images, there is a possibility that we have only seen some kind of foreplay from Claire. (Also, the last teaser shows that the straps of Sophia's blouse are not yet back over her shoulder).
If we assume that there is another seduction attempt by Claire and that Dylan returns to the barbershop alone from the date with Marie in the cafe, he will get the chance to observe the sexual interaction between Sophia and Claire.
Only this time, unlike the yoga event, he gets caught.
Both Sophia and Dylan will be embarrassed by the situation, both will feel guilt and fear of the possible consequences. From the subsequent conversation between Sophia and Dylan, the alliance/complicity develops. Both can blame the other for their behavior but both must also fear exposure. But Dylan must also admit that he enjoyed watching and Sophia that she is sexually open to extramarital sex and that she is "possibly" bisexual.
Also, there is the approach to SexEd (Sophia will explain to Dylan that a woman knows exactly how to sexually stimulate a woman) and the cuckold route (a lesbian event is a good start because the jealousy factor will not play such a role for Dylan).
