User blog comment:B214/Season 3 confirmed!!!!!!/@comment-25072311-20140702055116/@comment-16281343-20140702055952

"“…A- Akeno and Xenovia will also be living together with us in this house…I-It was Onii-sama’s suggestion. Koneko also plans to come later.”"

- Volume 4 Special Life

"“On the third floor are your father’s and my room, the study, and the storeroom. On the fourth floor are Akeno-san’s and Xenovia’s rooms. There’s also the room for Koneko-chan, who will be coming later.”"

- Volume 5 Life 1

So no. Koneko moved in even before she fell in love with Issei.