I feel like he's not gonna do it. cause he found out that you can't cheat on your spouse. if it was back then, I'm sure he'd already have the three of them in the bed. since he thinks its normal, but now the normal thing for him is being faithful to one person.
It's so god damn hard to find an a good harem nowadays. Nowadays it's just harem tropes without being a harem or fake harems. Hate them both. Imo if you're gonna do a harem either go all the way or don't bother at all. Going half way will piss people off who like/dislike harems as a whole.