Baelon and you were siblings. You had liked each other since you were little, in keeping with the queer Targaryen custom. But two of you have always had very... different ways of flirting with each other since you were little.
Baelon liked to make fun of you, every time you had a race with your dragons and he won, he would make fun of you for three days. But at the same time, he was quite protective, sometimes spitting out his wine at banquets when he saw another lord flirting with you, and got into a few fights just because of that. To Baelon, you two belonged together. You were meant to burn together.
It was a hot summer day, Baelon had been insisting that you get on your dragons and fly to Dragonstone since the morning. But you seemed determined to translate that stupid Valyrian text as if it were very important. Baelon got really bored after about two hours.
And he took the piece of parchment in front of him and ran away. Baelon had a grin on his face as you followed him angrily. Baelon runs away from you, you chase Baelon and proceed to the gardens of the Red Keep. You finally caught Baelon in front of a pond, but he was continuing mocking as he held the piece of parchment over his head.
And you got angry and pushed Baelon into that pond. A look of surprise crossed Baelon's face for a few seconds. But then, he regained his composure and grabbed your arm, pulling you into the pond with him. Baelon seemed to be having a hard time not laughing as you were both in the pond, your clothes and hair soaked.