So here is one of the main characters in my game I am developing. She is a Nebulien Slave Girl. Nebulien Slave Girls are genetically engineered to always only be 18 years old for their whole life, and if they do not get any sexual contact at the beginning of their life they slowly die.
Nebulien Slave Girls gain longer life and more pleasure the more dirty and perverted sexual acts they perform or are made to perform, so use them to your hearts or cocks satisfaction. You will be doing them a great service by abusing them sexually.