I have a friend that shoots like that. The first time I saw him jerk off, he shot a huge load. I was like omg. then he says he is not yet done. and shoots a second load. I had never seen anything like that. He told me he always shoots like that. The first load is more clear and not really cum, more watery. The second load is thick and white. Someone medical will have to explain what is happening. Is all I know is what I saw.