Out of sight, out of mind
That is what Aegon told himself. She couldn't be more out of sight. She was all the way in the north, a guard to her sister queen, and had been for more than year. But she was not out of mind. Never out of mind.
Daenerys had asked her to stay, to be in her Queensguard, but she said no. Arya said that she had helped Daenerys claim and secure her throne, but now she felt she had to do the same for her own sister.
Aegon had asked her to stay, for him, but she had just smiled sadly. She said that she could never again live in King's Landing. Then Arya had kissed him and walked away. It was the last time he had seen her.
And now she was up north, with a child. A girl named Cat, born eight months after she departed from King's Landing.
He had to learn this through his Aunt. His still remember the way Dany's eyebrow arched as she read him the letter from the Queen in the North. Arya hadn't even bothered to send a raven herself.
Sansa had written of Cat being a lively child, and that motherhood suited Arya in her own way. She wrote of Cat's dark brown hair and dark blue eyes. Not like you, Dany did not say it, but the message was clear in her eyes.
There was no proof that Cat was his daughter. But no one knew how dark hair could bring out the blue in purple eyes like Aegon.