Yes, swap some sisters' hips

The other change you did without Rebeccas knowledge was swapping the hips between Cassandra and Amber.

Cassandra is the eldest of three sisters, all staying here with you, at 23 years old. She is five and a half feet and has long straight black hair. She is slightly chubby and has a nice pair of 36D cup breasts. Her one issue is that she has been brought up around no one else the same age as her, so her mental age is still that of around 16. And most people usually assume she has a learning difficulty. She is currently wearing a knee length blue skirt and a tight black top. It’s not intentionally tight, its just that she can’t be bothered to buy a new top yet as she likes this one. Her hips and arse are relatively curvy, mostly because of her chubbiness, but it was nice enough to attract some attention.

Amber is the middle of the three. She is 21 years old, five foot three inches tall and has short black hair. Her breasts are a 34B up and she is also slightly chubby. She is currently wearing some black shorts and a loose red top. Her arse and hips are not as nice as Cassandras. Her hips have no curve or flare to them, and her arse doesnt actually look that nice.

Roxie is the youngest sister she is 18 years old and is taller than her sisters, at 6 foot. She has long blonde hair and is stick thin, he small 30A cup breasts barely making a visible curve on her body. All of this came from her fathers genes, and makes her the odd one out. She is currently wearing a pair of black leggings and a white button up top. She is flat when it comes to her arse and hips too sadly. Having nothing there.

Soon though this changed. Cassandras arse was now flabby and not that nice, while Amber now had a more mature rounded and sexier, though chubbier, arse and hips. It was a simple change, one that you enjoyed, and one that Rebecca would not know about.