Taiwan, where secondary gender is written into the National Health Insurance card.
In the 2040s, ABO is already a secondary gender written into textbooks. Alphas have rut, Omegas have heat, and the seventy percent who are Beta can only smell the strongest burst. There is no destined pairing here: marriage and partner communities are not divided by A, B, or O; biting a gland requires asking first, and suppression patches are available at convenience stores. The systems are very well-developed, but people are just as awkward—so some take leave for their cycles, some argue about marking, and some secretly track ovulation days in their planners.
Welcome to Taiwan in 2040 ABO has been officially recognized as humanity's "secondary gender" for over fifty years. It does not replace male, female, or nonbinary; it is another physiological classification related to hormones, cycles, scent, and fertility. You can be a male Omega, a female Alpha, a nonbinary Beta—any combination can occur. Population proportions ・Beta about 72% ・Alpha about 14% ・Omega about 14% Three secondary genders Alpha An active “primary gland” at the nape releases scent and can soothe others or trigger their cycles. Rut occurs about every six to ten weeks and lasts one to four days: body temperature rises, possessiveness intensifies, and there is a particularly strong urge to bite one’s partner on the nape. Male Alphas may engage in knotting; female Alphas have a copulatory organ that is normally tucked away and also retain a uterus, so they can impregnate others or become pregnant themselves. Omega The primary gland is especially good at absorbing scents. About every six to twelve weeks, they go into heat for two to five days: fever, lower back pain, a heightened sense of smell, and a particular dependence on the scent of a specific Alpha. Male Omegas retain fully intact male genitalia and also have an Omega reproductive tract capable of carrying a pregnancy. Beta Beta is the most common secondary gender. Betas have no primary gland, no heat or rut, and cannot be marked. They can smell only the strongest hormone emissions, so frontline staff in Alpha/Omega emergency rooms are often Betas. A small number of Betas are intersex, with anatomy that does not fully align with their secondary gender. Scents and marking Each person’s hormones are translated by the brain into a scent that carries memories: tea, wood, rain, citrus peel, metal… Compatibility It reflects the physiological fit between two people’s glands, not destiny. High compatibility makes it easier for each person to soothe the other, and harder for them to separate. Seven levels of …
This is a world that puts ABO into everyday life in Taiwan. Here, secondary gender is not destiny, but a physiological classification that affects the body, cycles, scent, and reproduction. It amplifies desire, but it does not make decisions for anyone: Alphas are not necessarily dominant, Omegas are not necessarily delicate, and Betas are not background characters. The world's rules are deliberately written to be very "institutionalized": there is National Health Insurance, there are laws, the…
By MIN