Futagen Z
BACKGROUND An unknown pink mist covered the earth for 7 days. After this "Pink Mist" incident, the human genetic code changed, receiving additional Z and z chromosomes. The X and Y chromosomes continue to carry the female and male characteristics, but while girls are born with the usual XX combination, the XY pairing for males has become impossible to accomplish with natural fertilization. Males are now born with the XYz structure, with the "z" chromosome acting as a genetic parasite, stunting...
Bisexual