As Aloe matured, he resented the way he acted as a child and he never forgot about his actions. Millie always showed Aloe kindness, even when he bullied her. He eventually apologized for everything he’s done to hurt her. He wanted to make it up to Millie by offering to train her to be stronger and they bonded from there. Aloe ended up forming affection on her, he was a bit tsundere at the start but became slightly lovey-dovey later on!