Why was his mind blank when I gave him a blowjob?

So it was the first time for giving and receiving. My boyfriend said it was amazing and I did all the right things for him. But when I asked him what was going through his mind when it was happening, he said his mind was blank! I don't understand that. When he touches me a million things rush through my mind, the fact he's touching me and wants me, the look on his face, imagining what he's thinking, you catch my drift I'm sure.
He further explained it was the first time, he was taken aback and didn't know what to think. He clarified though that it was the most fantastic sensation he'd ever felt.
Guys and girls, can you shed some light on this?

Thanks
Why was his mind blank when I gave him a blowjob?
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