Merlin made a little noise of panic despite himself when arms closed around him, the feeling of being trapped setting in; he'd never really been claustrophobic but it seemed there was always an exception.
He saw it right before it happened and it didn't help him to do so. He froze as Zach stole from him, thieved his first kiss away; he couldn't breathe, held his breath, closed his eyes and breathing came again and he wasn't sure if he was kissing back, wasn't sure what had possessed him but he was.