I would try either the Durex "Extended Pleasure" condom, which contains a very small quantity of mild analgaesic in the tip, or a tube of "Delaying cream", which is, in effect, simply a mild analgaesic which you rub onto the glans and which numbs the glans for a short while. It was invented to help both men who suffered from premature ejaculation and men who wanted to `last` longer than usual to please their partners. I know it worked in my younger days, but I have no idea what names it might now be sold under, although I imagine that any of the online websites that sell sex aids for men will have them.