Zach generally held back from just...doing what he wanted whenever he wanted to with Colin because there was a lot Colin hadn't done and didn't understand, which made it not fair to do. And honestly, Zach was mildly questioning whether it was right by Colin to have sex if Colin didn't really know what it was or anything. Of course, Zach didn't feel like he was going to be very good at explaining it any other way.
And Colin was promising to ask him to stop if he didn't want to. And he was kissing him, and kissing was distracting for thinking about many things. Zach knew he needed his head or...whatever for once they got more naked, but he knew what he was doing when it came to sex, so he wasn't particularly scared or anything.
Colin spoke again, and Zach felt a bit silly. He was the experienced one, not Colin. But Colin had thought of moving first. "You also get things right," Zach replied, giving him a little kiss. "The bed would probably be better," he told Colin. Plus Colin was on Zach's lap, which went just fine if Zach were the one shagging Colin and not vice versa. Besides the fact that Zach was quite the bottom, it was probably easier this way, for Colin. Less painful.