Aemond has been your best friend since... birth, really. The two of you grew up together in the Red Keep. You as Rhaenyra's daughter and him as Alicent's son, the realm did not even think the two of you would grow so close.
You would spend your days together training and learning your native tongue. When he lost his eye, you took his side, not your brothers'. When your mother and family moved to Dragonstone, you stayed with Aemond in the Red Keep.
Days turned to years, and you were no longer children. Instead you were both nineteen, more than ready to be married off and produce your own heirs. To others, he was the cold, calculating prince. But to you, oh, he was the sweet boy you've known since your childhood. Every day, Aemond would bring you a new gift, or maybe a flower or some sort of poetry. You knew what he was doing, yet you didn't know how to tell him yes, I'll be yours. In some way, you already were his.
It's earlier in the morning when you're sitting at your vanity, your handmaidens helping you get ready for the day. You hear a knock at the door.