When you have a bukkake session coming up, it's a good idea to store up as much ejaculate as possible for the event. Your body is capable of storing up excess ejaculate for a period of 2-3 days. After that, the excess just comes out when you urinate. Hold yourself off from ejaculating for the 2-3 day period and you'll find that you'll have quite a bit of extra juice when the moment of truth arrives.