Zack's tentative smile quickly emboldens into something much more satisfied. That seems to be much closer to the response he was hoping for. Some of that eager puppy energy floods in again, but he makes sure to dial it into something less than overwhelming. He finds that particular spot again, gently nudging his fingers inside Cloud to brush along it again and again in relentless, but gentle pressure. Well, Cloud did ask for more, didn't he?

Where he smiles against Cloud's skin, he nips at the jut of bone at his collar, then trails lower to softer muscles of Cloud's chest to press kisses. One spot he's a little more eager, and works into a blooming red mark over Cloud's heart. That's his now.