Patricia is surprised to find a young girl on her doorstep, wanting to rent a room. The girl, Lucy, is very small and looks young, even though she is 22 years old. Patricia gives Lucy a chance, and rents her a room on the understanding she respects house rules, but it isn't long before Lucy misbehaves. Patricia deals with infractions by an old-fashioned bare bottom spanking. As time goes by, Patricia learns more about her lodger, a girl who has had a difficult upbringing and no family to care for her, so when offered a temporary teaching job in another town, Patricia takes Lucy with her as her stepdaughter. Thus begins a new life for Lucy, who loves the strict but kind Patricia, her new mum who buys her little gifts and reads to her. In this tale of consensual age regression, Lucy goes to school again in the fifth form and slowly makes friends and begins to learn. She also learns from her mistakes, as the school is keen on corporal punishment, and Lucy ends up with a very sore bottom at school and at home. But she wouldn't trade places with anyone, for she enjoys being in a loving environment, having the chance to grow up all over again... and a spanked bottom is just a part of growing up.