Pleasing My Giant Sweetheart

Katie is a very demanding woman, at least when it comes to intimacy. Her boyfriend struggles to keep up with her insatiable demands, but he still gladly endures the 'workouts' that she subjects him to at night. One day, Colin gets infected with the shrinking disease. It will only last a few days, and Katie seems to want to help, but she is also very curious about the new and sexy possibilities Colin's new sizes open up.
How can the man keep up with the giant woman's demands as he shrinks to smaller and smaller sizes? Will he find the assistance of Rita, Katie's best friend, or will her presence only cause him more trouble?