Oikawa Tooru and (L/N) (F/N) were a perfect couple, or at least that was the case three years ago. Then, Oikawa ran away to something (or someone) better. But, when he runs into (L/N) he discovers something that makes him wish he'd stayed. I DO NOT OWN THE HAIKYUU FRANCHISE
If someone asks you what makes your heart beat faster, logically the answers would be: if you were nervous, surprised, excited, did something strenuous and if you had run. But there's also another reason why it beats. And that would be when you're in love. Although it seems so mawkish, in your case right now, unfortun...