The Extra Credit Society - The Extra Credit Society, #1

Chelsea Baylor and Helen Park have been best friends for their entire lives, so much so that they ended up going to the same college together. Things take a turn for the worse when their physics professor, the handsome Dr. Warner, thinks he catches them cheating. Warner offers them a way not to get expelled, but it's going to be a much... um, stiffer, task, then Chelsea could ever have imagined. How far are Chelsea and Helen willing to go to save their college careers? (Warning: This story contains graphic depictions of sexual acts and adult situations.
All characters depicted are over the age of 18 and all engage entirely consensually. Note: This is part one of a five-part series. All five stories are available as a single anthology.)