Two Sides of One Coin
So your character is just a normal boy. Or so he thinks. He's one of those shy kids of school, preferring the company of just a few close friends or even no one but himself if you like over that of many, one of those kids who a lot of people in the year would look at and wonder if he even went to their school. However his life is turned upside down when he returns from school on the eve of his 16th birthday to find his parents brutally murdered and is narrowly saved from a bomb that had been planted in his house by a popular girl from school. She quickly explains that there were people out there who were out there who were trying to kill him, though she refuses to reveal more until he is somewhere safe.
When they arrive at her house the girl reveals that he is part of a blood line that has been gifted with the ability to predict the future, though his family have not presented any signs for a number of generations now, until him. She explains he's done something that has gotten their attention, meaning he's likely going to develop the powers tonight and that they were now after his life. Luckily they now think he's dead so he's safe as long as he keeps his head down. How does she know this? Well she can see the future too, though she's had a lot more preparation for this life than he has, training and such.
Apparently she's been watching him for quite a while now, just in case he did get powers and it has been her responsibility to keep him safe until they could confirm if he had them or not. However it's difficult to watch someone for that long without getting some kind of attachment to them. What is this girl hiding? What isn't she telling him?