The last 15 Images are out of order, so you might want to sort it out.
@alcantarilla
So the story is somewhat like this: The red-haired girl is a Slave Warrior who managed to escape -> Decided to become an Adventurer -> Got MCed -> Talked about her past relationship (the blonde being her younger sister) in one of the sex scenes -> The guy got interested and decided to search out her sister -> Reunion -> The sister was revealed to be evil (she wanted to bribe the male to completely break the red head, so as to generate sympathy from the masses and ask for support/donations, while putting up a "touching scene") -> The sister also got MCed as well.