CHAPTER IV: TEMPTATIONS WIHIN THE WIND (10)
Frustrated Pit had to give up his command to the last remaining angel soldier, since he had to remain in Kepler until Erin's body decayed and her energy was exhausted, to go out in soul and take her to the hereafter. When Wiz turns Erin into Hera or her version of a dragon, Pit understands that life had not only assigned him to be a transported angel and now, but to have a kind of friendship and relationship during Erin's life, since it was evident that life had assigned him to stay a long time at Kepler, and to be Erin's protective angel until the end of her physical days at Kepler.
This is why Pit basically becomes Erin's conscience and wisdom, which makes her communicate more and more with her, making her develop the ability to communicate a
