Judging by Nate's response, Garan guessed he was doing a-okay at this, and that made him far more comfortable. Garan finally decided that while his current ministrations were clearly appreciated, it was probably prudent to actually get Nate to his release, which would mean taking more of him into his mouth. And there was a lot of Nate, considering.
Tentatively, Garan eased more of Nate's arousal into his mouth, testing to see how much was comfortable. When he got to the point that he was sure he couldn't handle any more, he pulled back slowly, then repeated the motion. He knew he was being painfully slow, but Garan needed to know his limits, right?
After Garan was sure he was ready, he began bobbing up and down, gradually increasing his movements. He used his hand to make up for what he couldn't take into his mouth, stroking the skin firmly. Garan was trying not to think about what he was doing, really, because he'd start worrying and over-analyzing. No, really, this was better.