The 3rd chapter this time is all futa x futa, and takes place in a brothel. Natsumi is the one who recommended MC to go to the brothel, so there's nothing weird going on there. But Natsumi isn't featured in any sex scenes this time, if that's what you're hoping for.
While the other two chapters were good in their own right, this one outdoes both of the other ones in terms of action. Would love if the other characters visited the brothel as well.