Saying nothing Hiro watched his sister move forward with his blessing. With light steps, Tsugumi skipped toward her husbands and her sisters-in-law. A harem is already a selfish thing. No matter how one justifies it, harems break the very notion of fidelity.
As such, if one wishes to gain one, the dominant must become one who justifies having an army of lovers. Admitting that harems are selfish and do not make sense is the first step to making them better. Since your harem members already give you their everything, the least you can do is make them happy.
If it was hard to ensure the happiness of a single person, then no matter how impossible, the harem seeker must fulfill such an arduous task of pleasing his or her entire harem. This could be considered the absolute minimum if one wished to have multiple partners.