Every person has unique size of penis which is hard to make larger.However,in modern medicine they have found a way with which person get its size double of its original one.This is cosmetic procedure which is mostly done in USA and is very expensive.(you can check on internet)In this procedure they release the penis part which is hidden inside our body .It is believed that the part of penis which hang outside same part is hiding inside .So by cosmetic procedure they release this part.
In this procedure afterwards they teach exercises to person so that his erection should not be affected.
Only problem with this method is that person 's erection can get affected in 10 percent of cases.
Some creams claim to increase size but they are fake.
No cream can increase size.
As per PE is concerned it is mostly psychological.
When you are stressed and under pressure of performance you release soon.
Start and stop technique can work for it.
When you come close to climax, you stop for about 10-30 seconds and wait until the urge subsides. Than you continue with stimulation, and repeat the process. After a couple of cycles, let yourself to ejaculate.
This is how it happen.
If you see this useful link you can figure out what to do.
Hope you liked all info provided.Best of Luck.