Okay, maybe I'm a bit twisted when I smoke alot of meth.. With that said, this is definitely NSFW!
First of all, I am an uncut, gay dude..I have a job, bf for a few years- Oh, the uncut part, IMHO, is Absolutely crucial...I don't think a dude with a cut cock could experience the same as I do...so I have personally done the meth/cock thing many many times..(hundreds?) for me, it is not really a big deal..pretty much only when jerking off,it'd b way too embarrassing/awkward bringing up something like that with another person

... So the usual method for me is to scrape the barrel of the meth pipe with a paper clip, then sprinkle the powdered meth directly over the pulled back head.. There is not really any burning, more like a slight cooling, then tingling..copious amounts of precum follow..I do not ever recommend using shards direct from a bag, as solid rocks inserted directly in the peehole will burn a bit more, yet increase precum. I've also taken shards .3gram or so, dissolved/ mixed/ crushed in approximate 1/8 tsp of precum, then squirted directly down the cock hole- squeezing tightly around the top of the head, or else will spill over, lol.. If done correctly, it makes this tingling feeling down the shaft, instantly rock hard, leaking and, well, pulsating.This will last about 1-3 min, then feeling back to normal.. While I don't practice these things everytime I get off,I can see that I am in a way getting addicted to the acts, for me, the feeling it creates is like nothing I can describe.. And after the earth-shattering orgasm, I will feel like I'm totally some twisted sick fuck, and this is not normal or okay to do.. I'm sure this is not healthy for my dick either, but no long- term effects or discomfort