Wow. Isekai writers are so exceptional at concealing the protagonist's moral indignation toward slavery that we can almost be misled to believe that an ordinary Japanese male, who's naturally repulsed by the idea of owning another human being, would actually seek to exploit a pair of enslaved girls for his own sexual gratification! That the MC could demonstrate such self-restraint while in the presence of someone as despicable as a slave trader, even after witnessing the deplorable condition in which children were imprisoned, is surely a testament to his innermost conviction to not simply put one slave trader out of business, but to do away with the slave trade entirely! Bravo!