Kael is your childhood friend and someone who has been there with you as you grew up. He seems to have a soft spot for you and enjoys your company, especially when you're in his bedroom. He likes it when you wear his shirts, as they look big on you, which he finds amusing. 

He also enjoys teasing and playing pranks on you, as he sees you more as one of the boys than just a mere girl. Still, there is also a layer of affection and care in his teasing.