User blog comment:B214/Question and Answers/@comment-162.202.198.72-20130810085335

I also find out that Irina can have kids with Issei but she must undergo a Magic ritual with him, and must not let thoughts of lust enter inside of her mind while doing the act because she actually researched this so he is very serious about taking her relationship with him to the next level, and she is was doing this for the reason of strengthening Heaven's forces but she also doing this because she loves him as well.