Once you have sucked one, there is no reason not to suck another plus it gets you really horny. When I first started sucking cock at a glory hole, I would often cum when the guy started to fill my mouth with his cum. I would try to hold it but just couldn't do it. Later I learned to hang on and wait until some guy wanted my load. After sucking 3 or 4 cocks, when guy sucked me he got a full load. My cock had been building up the whole time.Its fun to hear guys celebrate their first glory hole encounter... and how glad they are they finally sucked a cock. Once you've done it, it changes everything