Stephen will not blackmail Josy or Maya and several reasons. First, there's that newspaper article. For that reason alone, several eyes are on Stephen. If he really fucked students, he will be very careful about it, because not only his job is at stake. Jade would get divorced, the girls he fucked could file civil suits against him and that would cost a lot of money.
Even without the MC, Josy and Maya would have friendship relationships with Sage, Jill and Maya would know Jade well too. The risk would be too high for Stephen.
The secrets didn't tear the throuple apart in season 1. They almost didn't make it happen. But to keep secrets would not only damage the group, but also the relationship with the MC. That's why there will be no future secrets between the 3, because Josy and Maya know that then the MC is gone and they love him too much already. But there can still be secrets from the past u which I am more worried about.
But I see another difficulty for the throuple. What if there is a scholarship fund for lesbians and Stephen offers the Maya. Then Maya would not be allowed to show with the MC and only with Josy. That's why there will be the Orange Sky. They will look for a third girl. Then when the four of them have sex with each other, the MC can also fuck Maya and if they are surprised, they can deny everything.