This Feeling: Love

In this first installment to the This Feeling Trilogy, Samuel Carter is a high school student, excelling at everything that crosses his path.
Until Trevor Summers, an old enemy of his, comes into his life and requires Samuel's tutelage. Samuel doesn't want anything to do with Trevor throughout every session the two of them have together, until...
He gets a strange tightness in his chest.
What does this mean for Samuel?