bultard,
Do you mean stories that take place over days and days? or stories that just in general have the person grow a little here and a little there? Here are a couple I think will fit either situation, they are more expensive cause they are longer.
Training to Drain
Housewife Gains
Dwarfing the Caller
Gym Draining
Long Term Draining
If you do decide to pick any of them up let me know what you think! If you'd rather commission something from me I'm open to that as well.