Life Hacks/Charity's taboos and interests
Sexual history
Since Charity learned about sex from her mother at age 10, she has secretly harbored sexual fantasies about her twin Xander. She knows this is unacceptable though, and his wimpy nerdiness making him an undesirable partner (substituted for intimidating greatness making her feel she was not worthy of his attention in her memory after he modifies himself) made her suppress this side of her.
When she was 11, she took notice of how her 4 year old sister Roni would always wear skirts with nothing on underneath. She saw her sister as approachable for her budding desire to experiment sexually. Eventually, Angelica found out and asked to be included. When Angelica started asking about boy's privates, Charity feeling powerful as the one who knew everything about these subjects went out to grab her little brother Bastian into the mix, and turned him into the surrogate for her twin in her pent up sexual desire as she greedily fondled his then 8 year old cock and balls once he was in the picture. Unfortunately, this boldness lead to them getting caught.
Since she got in trouble, she began putting a miss-placed resentment on to her brother Xander for her punishment even though he was not involved. In her mind, she only got in trouble because it was her doing it with the kids and not her twin that got her caught. She also sort of resents him for being the same age as her but a lot more trusted by her mother, father, and older sister for his lack of involvement in all of those things.
Roni, the one Charity had molested the longest, seemed to want to continue their "games," but she knew she would get hell for it so she pushed her away. She has recently felt a longing for the old days when her and Roni used to play their innocent childhood games. She knows better how bad that was now, but she couldn't help it when she saw her opportunity taking Roni to her base-ball games at the park and Roni seemed plenty willing to pick up where they left off using the park's family restroom facilities. However, she heard her older sister Brittany was coming back, so she is now avoiding going to the park for fear Brittany will catch on to what she was doing.
Sexual Knowledge
Charity and Xander were the last members of the siblings to get "the talk" from their parents, their parents having started to feel too overwhelmed with the number of children after that and figuring Brittany or someone else would tell them what they needed to know. As such, Charity's sexual knowledge is fairly complete. She knows all the text-book facts about sex that an average virgin adult would.