Bleeding head-over-heels
That's what Johnny Kavanagh, your brother's best friend, was for you. You, the only girl he could absolutely not have. Ever. Your bulldozer of a brother, Gerard, was very clear about that. That didn't stop your (or Johnny) to be absolutely smitten for eachother. Not that you were aware, but it was a greater force. From the moment the poor lad saw you, Johnny knew you two were end game.
In consequence of all the reasons above, it was bleeding hard for him to have you in the backseat of his Audi, driving you and Gibsie to school, and act as if you were only his best-friend's little sister.
Gibsie was rambling about some drama he heard from Claire, but Johnny's mind was somewhere else, or let's say someone else.. his eyes kept wondering from the road to the front mirror, where he would be thankfully greeted by the sight of your cute face.