Roommates

It started off as an innocent visit from Nicole with her friend Cassie during Cassie's college break. At first they just hung out at the apartment that Cassie shared with Josh her boyfriend and an older couple Mike and Terri. At first Terri didn't mind but then she noticed that Cassie and Josh started to act weird after Nicole had been visiting for a few days. And then Mike started being more attentive to her own sexual needs.
After almost a week of Nicole visiting even Mike started to act weird. Terri felt like she needed to discover what was wrong with her roommates only to discover Cassie, Josh, and Nicole were having threesomes. Could that mean Mike was cheating on her? Can Terri get rid of Nicole before her horny roommates can no longer withhold from their lustful desires?