I especially like erotic stories where women / girls are asked to lose weight and get really skinny - pound by pound.
I don't mind whether its a male or a female who pushed for it or both.
Compliments about the skiniier body. Weighing scenes, etc.
Shopping scenes to buy smaller and sexier dresses, bikinis, strings tangas

An example I found was Aqcuistion from Headhunter. Like this but down to lower weights and more dedication to the figure improvement.

Any ideas? Or any hints to other stories are more than welcome. Thanks