Can I just give my best deep-throating tip?
When a deep-throater forces the cock down his or her throat and then stays that way, it's impressive, yes, but it doesn't feel like much. Cocks like motion. Keep moving.
The best blojob I EVER got was a guy who would at random times, just when I thought he wouldn't do it again, just go all the way down on my shaft, and then come back up slowly and smoothly. The whole time I was just waiting, wanting, hoping, praying for another deep stroke. I finally came during one of those deep strokes . . . I hope the cocksucker managed to get a taste, because I was buried deep when I blew.