Time know only Death

This follows the life of a boy named Tristan Bell, also known as Subject Z. He is a boy with a gift, a gift that was born to him and only him because of a genetic mutation that combined his chromosomes in a way that made him unique, he had been born with 2 y chromosomes, however it was not just that, they had combined shortly after his birth into a new chromosome, Chromosome Z.

Also maybe some BoyxBoy later on