I once used a long lasting numb cream. Forgot the name of it... but it was some Chinese product. I made the mistake of putting too much of it and mr.happy started to burn for a long one hour and I had booked a session with a SP. Needless to say by the time I got to the motel and the SP arrived the burning stopped but no matter what she did I was not able to get a SOG . Make sure to start by putting a little.