It happens to me but not very often.
I was edging one day, very aroused, and hadn't ejaculated in about a week or so. I was extremely horny. My dick started to twitch, throb, and pulse a few times. I noticed on the last pulse a few drops of pre-cum sprung out. The feeling is akin to a semi release as it cooled me off a bit.
I experienced it only once so far while receiving oral sex. As soon as the giver's lips glided off of my dick, a string of pre-cum followed. I was being edged in that situation too. The giver slowly went down to the circumcision scar with a gentle suction and loosely puckered lips then came up very abruptly. At that point, my body begin to shudder and my dick started rocking. Then a large bead of pre-cum popped out and hit the tile floor while another stayed glistening on the tip. I told the giver that it wouldn't be long now.