Thread:Valaruko/@comment-1359322-20140706035657

Regarding your questions.

For the first one,

"“If the man is wishing for that, then it’s your role as the heir to manage it. If it’s going to increase even more, you will have to do it properly from now on. It was I, who took control of it in the case with your father. It’s a usual thing in the World for a woman to be attracted by men who are both charming and strong. Sirzechs only has Grayfia because he is a Maou, but “he” isn’t aiming to become Maou correct? Then there isn’t any problem……Or you still haven't made a decision on it yet? Oh my. I thought you inherited the pushy attitude from me, but for you to become weak at the last and crucial moment….. Once you form a relationship, you can also gain the authority of other women around him. Rias, can you not even make progress in your relationship with him without Grayfia and I getting involved? ”"

- Volume 10 Life 1

As for the best friend thing, it's from Ishibumi's Twitter, he occasionally tweets on such things. 