User blog comment:TheBlueSlug/Ending/@comment-24098614-20141115011727

The answer is a definite yes because a Harem is required, and it is  a must for the ending nothing less than this is acceptable because a severe backlash will be given to the Author by the fans especially with a Main character like Issei.

I don't want to see all those Female characters with broken hearts even though originally Rias wanted no part of this because she was selfish in her nature, and she didn't  want to share with nobody, and I don't blame her at all but she understood that if she wants Issei you have to sacrifice your intentions to make him happy because Issei would be happy with Rias alone but he would be heartbroken because it is his dream, and he thinks that he can make all the giirls happy so you have to give him a chance to prove this.