A few theories I have going forward. Some are fairly obvious, some are a little more out there.
1. Stacy is the MC's cousin. He remembers her as a child but since he was young he confused her for his sister. Stacy remembers him as well but has been told she never had a brother. When Wendy and Stacy's mom/grandmother meet the shit will hit the fan.
2. They are setting up a Charles redemption arc. Belle mentions Charles was different before Katie and Ryker came around. Katie is a bit weird, but seems to be on the good side. Ryker played on Charles' inner Id and helped push Charles into his current dick persona.
3. Harper will forget all about that pesky student/teacher situation fairly soon, especially given the events of Day 7. Sleeping with him will cure her night terrors.
4. Ryker, Kenji will be kicked out of WVM. Damien is a question mark but will probably go too. Hopefully they are going to jail once they are discharged from the hospital.
5. The MC's dad was either responsible for Katie and Ryker's parents death, or their parents were responsible for his death. Ryker's hate for the MC has to come from somewhere and it isn't from trying to fix a college basketball season.
6. Azel and Harper will become more than friends. That one is more of a wish because they work so well with each other.
And finally
7. Jamie and Shauna will make it an official full love triangle. After their accidental kiss, they have finally crossed that line they were too scared to cross.