User blog comment:IamJakuhoRaikoben/Chapter 500: Fire and Ice, Review./@comment-24277053-20160905210258/@comment-5303512-20160905210839

Well, when you think about it, almost every villain groups have their own two female interactions and relations.

Oracion Seis: Angel & Ares = Master & Slave

Grimoire Heart: Ultear & Meredy = Mother & Daughter

Tartaros: Kyouka & Sayla = I guess Lovers

Avatar: Briar & Mary = taunting girls

Alvarez Empire: Brandish & Dimaria = guessing Best Friends