alysen6: Hey Valley-
I'll take a shot at answering your question, see if you can improve your technique a little:
How much cock you can deep throat depends primarily on the suppression of your gag response. Unless the dick is simply too thick to fit down your throat (which is rare...hasn't happened to me yet), the upper limit is a function of your throat gagging and causing you to stop taking any more. Here are some tips you can try-
First, it's always easier on an empty stomach. If you have just eaten a meal (especially a big one), I've found that your throat is more sensitive and you are more likely to feel nauseous and gag when deep-throating. Not sure scientifically why this is, but hey...
Second, learn the best angle of your guy's cock. Your throat naturally curves down, so position yourself to where his cock curves down. Most guys have an upward curve (when they are hard it points up toward their head), so if your guy curves up as well, try straddling his chest and facing his dick from above. The angle will be MUCH easier to take this way.
Third, when you are giving him a blow job, feel free to use the full gamut of your mouth- sucking, tongue, lips, etc. But when you deep throat him, keep your throat and mouth FIXED- that is, don't suck or swallow. Think of making a firm tunnel with your throat and having him fuck it, in and out. If you try to move your throat muscles, you will most likely gag.
Lastly, go at a controlled pace for YOU- you can make the experience hot for him whether you go fast or slow, so take your time. Most guys love to be deep throated and held all the way down for as long as you can, so take him really slow and just hold it. This not only feels good for him, but it also helps your throat adjust to his size, so that you can get gradually faster if you want to.
Hope that helps, Valley. I love dating hung guys for exactly this reason- it's a fun challenge to work up to being able to handle their size, isn't it? Best of luck and give your guy my best...I mean, your best.
-Aly