I did this in about 5 minutes, it's only meant to be a joke
Master Chief fired the last rounds of his smg into the head of a grunt, today had been a good workout. Just as he was about to leave he saw something black and metal on the ground next to the grunt. Deciding to keep it as a trophy he bent down to pick up when OH MY GOD HE GOT TURNED INTO A GAY ROBOT SHARK. He knew that this was the end of his life as a Spartan but he also knew that this was the beginning of the world's greatest serial shark rapist of all time. He turned around to see some marines staring in awe at his robot face with his robot shark teeth; "OH NO THE CHIEF TURNED INTO A SHARK" cried one. "HE TURNED INTO A ROBOT SHARK" cried another, "HE TURNED INTO A, OH GOD HE'S RAPING ME" cried the last one. Like a fish out of water the chief splashed around on top of the marine, this was the best marine booty he ever had. He then ate the marine. The rest of the marines opened fire but they could not stop the nipples of robot sharkness. The Chief opened his mouth to speak "I am Chiefo el roboto de Sharko, butt rape arigatou" then he butt raped the first marine whilst the second started to cry like a little girl. Cortana wasn't pleased with this and decided to stop Master Chief. She got eaten. Chief looked at a elite that uncloaked in front of him and thought "Damn I never noticed how much elites look like sharks." Then they had wonderful sex on the ground whilst the lone marine crapped his pants. He also got ate after the sex. Oh yeah and also the Chief married that elite.