His gaze narrows. He believes Cloud fully, of course. But then how- Oh whatever, it doesn't really matter, does it? Fish just turned into candy right before their eyes. Lube in a place like this can't be that off-brand, right? He's not about to question a blessing.

"It's lube," Zack supplies helpfully, waving the little bottle in front of Cloud. "Which half-solves the issue. But uh, yeah-" Zack blushes a little deeper, and drags Cloud as close as possible to press his length against the other for just the tiniest bit of friction. "I'll go slow, but you think you're gonna be okay? I don't wanna hurt you."