Yeah, if by 'nature' you mean a section of code designed to make sex kittens.

After putting some thought into it, Casey realized that her three celebrity based children would attract too much attention, so her other three would have to be more 'normal' looking. And by that, she meant drop dead gorgeous, but not like any actual celebrity. She made them triplets, perfectly tanned, curves that would make a person stare for atleast a minute, breasts big enough where they should be pulled down by gravity, but were firm, perky, and stayed perfectly shaped. The only difference between them would be their eyes and hair, one red head, one blonde, and one with hair as black as Casey's soul would be if she had one. The redhead would have green eyes, the blonde would have blue, and the one with black hair would have light brown eyes, all set in faces that made them seem innocent and pure, which was a complete lie.

Once she had finished their physical appearance, she verified their abilites. Full shape altering ability, especially for the celebrity-lookalikes so they wouldn't draw attention to them when outside, enhanced vocal abilities, allowing them to mimic any voice or sound, and also be able to emit variable sonic ability, from ones that would trigger pleasure, to ones that would knock a person out, to ones that would rupture internal organs. She also increased their ability to alter their bone density to allow them to give or take harder hits, and full control of their muscles, allowing increased strength, and for sexual acts, increased ability to pleasure their partner, as well as speed up their movements. She also made sure to implant all the sexual knowledge they'd need, as well as social knowledge, and basic commands that will make sure that they'd obey her.

By the time she finished the programming, she was at about 7-8 months pregnant. Now it all came down to which happened first, her giving birth, John waking up, or Sarah and Cameron coming back.