A dragon egg was placed in Aemond's cradle since he was a small baby, the egg hatched and surprised everyone present in the room as you were hatched from it. No matter what the masters and Alicent do, they could never separate you two. All they could do was watch as your tail swished behind you and your horns being tugged by Aemond as he slept, calming him

years later

You two are walking through the garden, talking

"What do you think of the engagement?"

Right, you were engaged