Luka, Lexy and their Doctor
I have gone out of my comfort zone with this story. Luka is a grown man who likes to regress to a much younger age on weekends. Lexy is his wife, who takes care of him at these times. They form a close relationship with their fertility doctor, Frank, who helps Luka regress to an even younger age.
***Note: there is M/M sex in this story so please do not read if this bothers you.