Content warnings specific to this chapter: No sex, pseudo medical 
information.

Author's Notes: This is less a proper chapter and more an explanation of 
the fictional sexually transmitted "disease" that is the driving idea 
behind this story, framed as an entry from a fictional medical database. 
Some of the characters will figure out some of this, but most will be 
too busy enjoying themselves to care.

Futanari Outbreak by Imouto Kitten

Chapter 2: Excerpt from the Catalogue of Sexually Transmitted Magic

Condition Name: Futanarism

Origin: Unknown, but suspected to be closely related to the origin of 
all wizard magic.

Prevalence: Present in all Flower-Born Wizards, No known extant lines in 
Witch or Human populations.

Known Transmission Media: Seminal Fluid, Vaginal Secretions, blood.

Known Infection Sites: Skin, Lining of the vagina and uterus, lining of 
the rectum and colon, lining of the mouth, throat, and esophagus.

Can be Transmitted from Mother to Child in the womb: Yes

Symptoms Exclusive to Males: None

Symptoms exclusive to females:

The Clitoris grows by a few orders of magnitude, encasing the urethra in 
the process. When finished, it is indistinguishable from a male penis. 
Being by far the most noticeable symptom, this is why the condition was 
dubbed futanarism.

The Ovaries undergo restructuring that allows them to produce sperm and 
seminal fluid. Tubes analogous to the Vas deferans grow to connect the 
altered ovaries to the urethra.

Since females lack a Y chromosome, futanari can only produce X-sperm. 
Coupled with the almost perfect transmission rates between partners 
during copulation and from mother to child during pregnancy, Futanari 
can only sire more Futanari. Futanari can only birth sons if the sire is 
male, and even daughters sired by men will be born as futanari if the 
mother is infected.

The normal menstral cycle is disrupted. Instead, the Uterine lining 
shall remain in a perpetual state of being ready to accept an embryo, 
and the altered ovaries will ovulate at least once a week. Since the 
period from fertilization to implantation can take longer than a week, A 
second ovulation can occur after the first egg is fertilized but before 
implantation. As a result, twins and triplets are much more common with 
futanari mothers than with normal females.

Infected females will not undergo menopause, and those infected 
post-menopause shall undergo a rejuvenation of sorts.

The walls of the vagina and uterus gain extreme elasticity. Exact limits 
are unknown, but a virgin futanari's vagina can be stretched without 
pain to a size sufficient to allow passage of a 30 cm sphere and 
immediately contract to firmly grip an ordinary pencil. A never 
stretched futanari uterus can accomodate being pumped full of 12 liters 
of fluid in under a minute and return to its unstretched size upon being 
drained. As a result, pain during childbirth is almost unheard of in 
futanari and many find various forms of extreme penetration enjoyable.

The cervix becomes capable of forming watertight seals either on its own 
or around any convex object.

There is no mechanism to prevent futanari from impregnating themselves.

Symptoms common to males and females:

Severely heightened sexual desire, bordering on bouts of nymphomania at 
times.

The pre-cum of infected individuals is capable of painlessly dissolving 
a virgin female's hymen.

The Penis of infected individuals will grow in length and width during 
any penetrative act. The penetrated partner's ability to comfortably 
stretch to accomodate tends to be a natural limiter to this growth, but 
sadism in the penetrating partner or masochism in the penetrated partner 
can override this limit.

The penises of infected individuals posess a bulbus glandus or knot, 
similar to those found in canid males. However, infected individuals 
have some control over whether they knot with their partner, and the 
knot generally won't swell if it would cause pain to the penetrated 
partner.

Infected individuals produce far greater volumes of sperm and seminal 
fluid. Some ejaculations are measured in liters, though the penetrated 
partner's ability to accomodate the volume tends to be the limiting 
factor.

The skin, urinary bladder, and lining of the digestive tract gain 
elasticity comparable to that found in the vaginas and uteruses of 
infected females.

Those born with the condition are prone to precocious puberty, with most 
reaching sexual maturity by age 5. There is insufficient data to 
determine if this holds true for those infected prior to pubescence.

Treatment: There is no known cure, and even strong magic can only 
suppress the futanari transformation for short periods.