Hmm...is Houjou setting Aoi and Minedera up, or will she get jealous. I kind of have a feeling that Houjou only sees Minedera as a toy, and not a romantic interest.
That's why you shouldn't tie yourself up without proper knowledge and education. It's could be dangerous and harmful like what zen did there. Though he turn into such a decent slave, being thoughtful for his master like that.