If it does make Zack's task any more difficult he doesn't say or show it. If anything, he tries to match the rocking rhythm of Cloud's hips with the curl and thrust of his fingers. He doesn't try to keep Cloud still at all, just lets him move and grind however he needs, whatever makes him feel good. Zack can't think of anything else he'd ever want more.

"Hey," he rumbles when Cloud gasps his name like that, so wanting and eager. Tipping his head, he steals a kiss from those soft lips, and Cloud might be able to feel the smile there too. It's certainly there when he draws back. "I gotcha, Cloud. You feeling good? You can take more, right?" That said, Zack carefully nudges a third digit alongside the others, some of his normal impatience picking up with the heady want.