Welp... this was fun... until I saw the futanari tag in the tag list of the web novel in Novel Updates. Guess this is my stop.
Male MC + Harem + Futa isn't my thing, I'm not down for some presumably soft NTR when your average japanese MC isn't for the lewds of his girls and they will start to "play" without him now that he's not the only one with a "Babylon Tower" in the harem.