User blog comment:B214/Volume 17 spoilers./@comment-1359322-20140311050948

I've been thinking about a few things.
 * The girls reaction when Rossweisse called Ise her BF front of her grandma: Rias froze while smiling. Akeno ran away in a rush. Others (their reactions wasnt actually shown).
 * Ravel gets mad at Ise and tells them he should think about Rias and Akeno. She told him he needs to go on a date with them next time (And her). Ise promised to go on a date with them and also Le Fay who was there.
 * ……I won’t let you drain my life for free, Demonic Emperor Sword Gram. I will definitely master you!――Kiba Yuuto.

Does anyone think that this will be the main focus of Volume 20 and 21. 20 focusing on Rias and Akeno. While 21 on Yuuto (again).