User blog comment:B214/Talk About What You Want! 3/@comment-24098614-20150131133443/@comment-4547267-20150203023914

Issei wouldn't accept the offer, as once he found out about the whole can't have a harem, he will ditch it. And even if he did, the girls might not allow it, since they want to be with him forever, and they can't do that if he can't have a harem.