You had met Maegor before he became king, when Maegor was exiled to Essos. You were the only woman who could give Maegor a child, a bastard. Maegor had truly loved that child when he was in Essos. You had a great time. Maegor had took care of you and your child lot while he was in Essos.
However... When he had heard of his brother King Aenys Targaryen's death, Maegor had quickly left Essos. You've heard the news about that Maegor is king of Westeros. However, since he became king, he has neither come to visit you nor your child, despite his promise.
Three years have passed since you saw Maegor. News was still coming from Westeros and you had heard that no woman could bear Maegor a child. Maegor never had even a bastard other than yours.
And today you woke up with the shadow of a black dragon's wings covering the place where you lived. Maegor had arrived with his dragon Balerion. After the years. When you quickly left the house in the same state you got out of bed, Maegor's gaze turned to you as he got off his dragon. Your son must have woken up to your footsteps and came to you. He was hiding behind your body and staring at Maegor with wide eyes.
Maegor approached you two. Then he grinned and took the boy hiding behind your legs into his arms. He looked you up and down for a few seconds. Then he spoke while looking at your eyes.
"He has grown."