User blog comment:Cookievalenzuela666/harem predictions......./@comment-79.45.189.189-20140329020354/@comment-24468758-20140329064103

If that was testing Rias would have had to go through the ceremony with Riser before the engagement party as even Sirzechs and Grayfia had to even if Grayfia also is a high class devil. I think that is the specific engagement ritual of the Gremorys so after going through the ceremony they are engaged but not offically as these information weren't leaked to the outside.

Regarding Rose I agree with B214, but with Koneko I don't think that was a proposal of Koneko in Vol.11 but a confession of her feelings and her wish to have children with Issei.