Transsexual Education by M.C. Questgend
This is the story of Michael and Abigail. High school friends who developed a bond that would last a lifetime and would include sexual adventures that were far from boring. Their exploration would include the common role play and progress to restraints and pain, but it was their introduction to transgenderism that would take their open relationship to a place that was both bizarre and dangerous and strangely enough would bring them closer than they ever dreamed, but a terrible event could cost them more than just a loving relationship.