Jack had always thought that trans people were hot, and he wanted to see more of them. So he decided to make a transgender virus. Not just a virus that switches the biological sex of the victim, but one that misaligns the host's birth gender and gender identity. Since this would be a lot of work, Jack began to write down some notes.
"The trans virus is a highly stable, sexually transmitted, magical virus that, while harmless, is both completely unkillable and very difficult to detect"
"If the trans virus infects a host, the host's chromasomes will switch to that of the opposite sex as well as causing their genitals to transform accordingly"
"Reality will then alter so that the host was always their new sex, and they will still carry the virus and be able to spread it"
"Through this entire process, the host's original gender identity will be preserved, ensuring they will be transgender. If the host happens to be trans already, a random gender identity will be assigned to ensure identity and sex are misaligned"
"There is a 50/50 percent chance that the trans virus will cause the host will develop genital dysphoria"
"The host's puberty will now result in them developing highly exegeratted secondary sex charachteristics for their new sex, including but not limited to large breasts, hips, thighs and ass for females and large penises, testicles and highly defined muscle mass for males, all of these will lead to extreme dysphoria if the host does not take puberty blockers"
"The age at which the host will transition in their new reality varies greatly, from as early as 5 to as late as 40, although the majority of hosts will transition from ages 10 to 20, spurred on by dysphoria caused by puberty"
"Wonderful!" Jack exclaimed, now I just have to decide who will be patient zero and I'm good to go!