User blog comment:B214/Question and Answers 3/@comment-3965848-20140620151612/@comment-24098614-20140620201923

I wouldn't be surprised by taking a guess that he promised that he was going to marry her during Volume 18 remember I am taking a wild guess here but guys always tend to forget these promises because at such a young age it is ridiculous to consider this a serious thing. I do know that if this is the truth Irina will have to remind Issei about the promise because he might have forgotten it, and I hope that in this Volume she kisses him because it will be interesting to see a Angel kiss a Devil that would be fun to see because that is something that you don't see happen too often.