Step daughters/Anna
Anna
Physically, Anna is your average 35 years old mom of three. She has a great heart and means well most of the time but she is not the brightest tool of the shelf. She works as a school adviser so you'd think she knows kids and how to handle them, at least a little thanks to her colleagues ... but she does not. The kids she advises likes her a lot since she is always available for them and make them feel welcome but you ain't sure her advises are any good and the kids' parent like her a lot less. Especially when she tells their children to just "be themselves" or to "follow their dreams" when their dream is to be professional athletes or singers despite never showing any talent in it.
At home she just does not manage anymore and it worsened quickly after her last pregnancy. Her ex and her had a huge fight, her ex saying they could not manage another kid and her refusing to abort. The ex ... is now an ex and she was indeed way above her head. Her oldest daughter Viki resents her more and more for the chaos at home, the perceived lack of attention since Emma was born and she resents her for her father's leaving. All that to say that in addition to this already chaotic situation Viki decided to rebel and make the family's life even harder.
She desperately needs help and while she could normally read people well enough she will remain as blind as she can afford if you put some order back to her family. She is loyal, devoted, will have sex with you if you want but most of her energy and focus is on her kids. She wants the best for her kids but she is in a fragile state and therefore also very susceptible to manipulation (maybe even more so than her kids). Just be aware than in the heat of the moment she may accept to do things she later regret or feel extremely guilty about.
She likes sex but can easily go without it for a while. Her boobs are extremely sensitive which makes breastfeeding quite funny as this usually makes her very horny.
Viki
10 years old, she is a little devil in full rebellion against her mother. She likes to torment Chloe, the model child or sometimes even Emma the toddler just to make her mother mad.
She is very energetic but also easily angry and mean. Kids at her school are afraid of her.
Physically she would be very cute if she was not so damn insufferable. Nice face with angry eyes, lean body but perfect ass. You'd be shocked to see just how good she looks from the back when she bends over.
One good thing about her? She would do just about anything to hurt her mother, anything including seducing her mother's lover (you) or whoring up her sisters if you make a compelling case.
If you start with her it should be a secret from her mother the longest possible while she helps you sex up in secret the obedient Chloe and possibly the toddler or some of the people she bullies at school.
Chloe
Despite her young age, 6 years old Chloe is an obedient and dutiful little girl. Unlike Viki she does her best to help in the house and Viki resents her for that. Chloe does not understand why her sister hurts her so often but has blind faith in adults. She is not very sensitive and already often goes in her own little world when she can.
If you ask her to do something she will likely do it but beware that one of the rules of her mother is: "if someone asks you not to tell your mother, you tell your mother everything about it". Still she may be persuaded to keep a secret but it is unlikely to work for to much or for long unless you have help from either her mother or her sister.
Emma
Emma is but a young toddler still breastfeeding at about 18 months. She can say a few words or an extremely short sentence (two to four words) and Anna spends a lot of time with her. She is being breastfed more than most girls her age.