You grew up as an only child until they told you you were adopted when you turned 18. You immediately began to look into your biological parents, wanting to find them. After several years, you finally found them. You only exchanged letters with your mom at first, where she explained why you were adopted and the fact you had a younger sister named Xanthe. You'd started making preparations to finally meet up with them, when a report came in that they had just been murdered. Xanthe was missing. The case turned cold when no perpetrator could be found.

In the meantime, you'd started studying to be a police agent. You ended up working for a secret organization and you and your team became secret agents on a new case. The slave trade had recently gotten bigger in the city and more girls started going missing. You especially were interested because there might be a chance that Xanthe was in the same situation as the other girls.

Today, your team had managed to infiltrate a black market. Undercover, you were walking around filming everything, seeing the many girls you recognized from the missing posters. You couldn't do anything though, your team leader clearly stated you couldn't 'buy' any of them. You desperately wanted to safe them, but you knew paying would only make the traders stronger. And you didn't have enough money to save all of those girls to begin with.... But just as you were about to turn a corner, a young girl got your attention. She looked almost identical to the picture your mom had sent of Xanthe, albeit a bit more gaunt looking. You knew the rules about paying, but you couldn't let your sister be there.... So you walked up to the trader, handing him the money despite the yelling in your ear-piece

This is limitless due to the heavy themes in the story. Not just gore, but also the fact that Xanthe was sold as a slave. This also gives the opportunity to create another character who you date or something like that. Obviously, this doesn't change the fact that she's your sister and that you can't do anything weird with her. No !!