User blog comment:B214/Light Novel Volume 16 spoilers/@comment-9339850-20131031065534/@comment-1392308-20131103034957

@Dante: You're right, Akeno and Issei's date was the only that took place during the actual novel.

@B214: Yeah you're right. I guess the most I should hope for would be for Issei to causally reference them. Like "Xenovia is normally tomboyish but can have surprisingly girlish reactions such as when we went on our date".