Throw your legs behind your head so your dick is hovering over your face and just cum in your mouth
First few times you will immediately regret it, after that it won’t bother you too much but you still spit, then one day you’ll swallow and it’s a game changer
I have an extremely large penis so I can self suck, so it’s a little different for me. I will suck my own cock for hours if I have nothing else to do, end up with a comically large amount of splooge. I basically gulp it with every spurt in one fluid motion.