LUST?

ZK - Youngest boxing champion, good looking, influential, wild and notorious for his unbelievable stamina and ability to knockout an opponent literally seconds into a fight.
Zayn King lived by one motto 'YOLO' so he lives everyday like it's his last, reckless and daring, feelings and emotions were a luxury he couldn't afford, giving the life he led and enjoyed.
Zayn was in control, he had it all figured out until he found the wind being knocked out his lungs by the simple existence of a young barista-- Said Barista gaining unwelcome attention of his longtime rival, throwing Zayn back into discomfort of reliving the past he'd try so desperately to crawl out of. 
Zayn, who never had to fight for anything other than an overly designed belt or the adrenaline rush that comes with inflicting pain on another, suddenly found himself willing and ready to face the rival he'd promised never to give a strand of his attention to. 
Why? He'd work it out along the way.