The Extra Credit Society 2: Homework Assignments - The Extra Credit Society, #2

Joining the Extra Credit Society seemed so easy. It was a simple exchange. Best friends Helen Park and Chelsea Baylor would have a night of sex with their physics professor and his incredibly hot wife (and with each other, which Chelsea did not expect to enjoy as much as she had), and they would avoid getting kicked out of school. Chelsea's boyfriend Cam never had to hear about it, and life could go on as normal.
Things got complicated when Cam shows up in the middle of their menage a quatre, catching Chelsea in the most compromising of positions. They can't exactly be mad at each other if they're both members of the Society, but how does this change things for them? Is their relationship over, or are things about to get hotter than either of them ever dreamed?This 5, 800 word story is the second in a five-part series.
All five are available as a single anthology. This story contains depictions of sexual acts and adult situations. All characters depicted are over the age of 18 and all engage entirely consensually.