Making Him Cum Too Soon

I was with a guy and he wanted a blowjob so I told him to take his pants down and sit on the bed he was already hard I started stroking the head of his dick which made him moan then he said what you doing grab it and wank it and I said I will but I'm just going to stroke it and he said please just grab it then he started shaking and he cum hard!!! I just kept stroking it and loads of cum came out and he said sorry just wait i'll be ready in about 20 minutes so when he was ready again I started stroking the head of his dick and he said nooo please don't just grab it and I kept stroking it and his dick was moving so much and reacting to my hand stroking it then he said not again and he fell back on the bed shaking and he started cumming hard I got up and said got to go now bye.