User blog comment:B214/Light Novel Volume 16 spoilers/@comment-1359322-20140128093911

[I may be able to take a day off. Millicas, do you want to play Satan Red with me?] Satan Red of the “Maou squadron Satan Rangers”, who is Sirzechs-sama, enjoys playing with his son more than anything.

His son, Millicas, replied.

[No, Tou-sama. On the next day off, I’m going to Rias-neesama’s place! Under Ise-niisama and everyone else, I will be observing the living style of the Devils in Japan!]

Sirzechs-sama appeared to be very happy about it. He praised his son’s desire. But for the answer to the next question, Sirzechs-sama…..

[Yes, that is a very significant thing. By the way Millicas. Satan Red and Oppai Dragon. Which one do you prefer?]

[I would have to say Oppai Dragon! The armour with so many variations looks really amazing! I also think the toys are very good!]

[………]

I easily imagined the scene, where Millicas-sama replied energetically and Sirzechs-sama freezes with a forced smile.