If there's any clumsiness, he assumes it's on his own part, and he immediately tries to shift his angle to make it better without losing any of that eager intensity. After all, he didn't want her coming away from this with the idea that the genius Hyuuga Neji couldn't kiss, did he?!

As she leans back, he follows, his bangs falling to frame either side of her face as he keeps his gentle grasp on her cheek. The warmth was dizzying, and only belatedly did he realize that he couldn't breath like this, and pulls back to break the kiss, breath coming in small pants through his open mouth. A part of him is hoping that she'll kiss him again, but he wants to ask why...