Zack gives him a little poke in the ribs in reprimand, and ends up laughing quietly against Cloud's lips when he draws back for breath. He's trying to use it as a measure of patience, because otherwise he'd probably kiss himself breathless with how much he wants Cloud.

The fact Cloud picks it up so readily is exciting. Zack encourages it with physical praise, hands all over the smaller's body in approval. Eventually, they do end up wiggling beneath the waistline of Cloud's trousers, feeling the softer skin there. Zack makes a soft whine in the back of his throat when he can't get his hands any further down. Like a dog begging for more treats really.