To your first class.

arrive to the school campus in a huff, sweaty in the summer heat. The weather forecast had been rainy but the old adage, “never trust the weatherman” came true. It was only slightly cloudy and the blue sky stretched out above me. Jogging lightly i felt the toy squirm deliciously inside me, some of the remaining lube and clean sweat running down my inner thighs. I make it to the entrance an absolute sweaty and panting mess. I was a few minutes early due to my run, so i sat down on the floor after walking to my classroom for my assigned block. “C-138” read the placard above the door. The constant weight and stretching of teh toy during the run had put me in a near constant state of horny, and I was doubly glad for the chastity, as uncomfortable as it was. I didnt know anyone really in this class, though two of my best friends in school would be in my next one. Judy and Mac.

For now, once I caught my breath I walked into my futa biology class. Last time I had been here all the classes had been devoted to explaining the syllabi and stuff, so this would be the first real class this summer. I doubted this first class would be anything but basic stuff as well, so I didn't bother taking out all my stuff, just a single notebook and pen. Other students were milling around the room, choosing seats, and I bee lined for a seat in the far back, close to a window. As I sat down, dropping my notebook and pen on the desk, plopping my bag behind me, I scoped out the room. A decent mix of male and futa students, which after a quick impromptu head count, amounted to a 3/2 futa to male ratio. A few people caught my attention : a tall ebony girl who walked with a confident athletes stride, wearing shorts and a t-shirt, her breasts were surprisingly small at a B-cup, and a beautiful heart shaped ass. Her long dark legs sprawled out in front of her confidently as she sat down. She chose one of the front seats. A much smaller girl, chubby with wide brimmed glass which she reflexively pushed up onto her brow, her bright green eyes flit about, and black hair long and straight. Freckles adorned her face, and despite her dumpy sweater, her assets spilled out. Almost comparable in size to my mother...She fidgeted in her seat. An equally short girl looked around sullenly, the emo on her painfully obvious from the chains etcetera. She didnt really seem to have any discernible breasts, at most A-cup, but I could tell she was a futa from the lack of an Adam’s apple. Strange, most were usually developing at this age. Seems like another case just like Alyssa, and I sympathized with her.

In any case, my attention was drawn with a sharp sound from the teacher, a much older woman of perhaps 50 or 60 years old, with a full head of grey hair and a ramrod stiff back. Ever the stereotype, she held a ruler in one hand, seeming more like a baton than a measuring tool. I held back a laugh. She spoke about the nature of the course, and it’s first teaching block. “The basic anatomy of the futa, in historical their predecessors”. This should be interesting. I probably knew most of this stuff already, but who knew.

The teacher, whose name she gave as Ms. Allister, started with a history of the evolution between the two sexes. Due to the increased fertility of the average futa, sexual dimorphism started taking place in the genitalia. As time passed, men became naturally smaller in all ways, with lower and lower fertility, whereas the opposite was true for futa. What had started as an more or less equal size a few hundred thousand years ago diverged into what the world has now, oversized futa dicks and much smaller dicklets on the males. I didnt like the word dicklet at all, not because I was insecure about my size, but more because of the juvenile aspect to it.

But hey, the teacher said it. Males developed to have smaller size, not because of a younger age but simply that is the way it is. I was smaller than my younger sister after all.

Moving on from history, Ms.Allister came to the current biology of futas. A anatomical image of a cross section came up onscreen, which she promptly started to explain. The penis and vagina was self-explanatory, but what was interesting was the balls of a futa. Apparently, the testes of a young virile futa girl could produce inordinate amounts of semen, and have a much smaller refractory downtime between ejaculations. The longer a woman goes without ejaculating, the larger the testicles and the farther down they droop with the increased weight, because a futa has a constant semen production. Without constant draining this can damage the futa in many ways, leading to erectile dysfunction, etc and in some cases something call sack stretching. She showed a few interesting rare genetic disorders and reproductive abnormalities. She was gaining brownie points with the class, I thought to myself, show a few cool pictures and all that. She showed an image with a anticipatory smile of a real life case : it predictably drew a few laughs from the class, myself included. A shot of a cock and balls, but a pair of massive, almost melon sized balls drooped nearly a foot down from the base of the futas cock, a result of a sack stretching. She explained :

“This futa had not been drained in nearly two months, and this is the result. A permanently stretched sack even when properly regular ejaculation starts. This will not overly affect her capacities from sexual activity or reproduction, but she may required additional massage to her tests in order to stimulate proper ejaculation. And, obviously, it is difficult for her to properly tuck those into panties, I imagine” She smiles. “Accidental or not, please remember to ejaculate regularity. Depending on the rate of semen product, it may be as much as once every few days to one every few weeks. One case, a futa named Anita Hamill had a remarkable condition. She produced up to two gallons of semen every 4 hours. She is noted to be the more fertile futa in the world. She still remains alive to this day at age 79. As you can imagine, she still needs to be drained quite regularly, and has even started her own brand of milk drink, Hamill’s Own, which is sold in only the highest establishments at a frankly stupid price of 3 thousand dollar for a small glass.”. She pauses for a second, then grins : “Though the taste and texture is to die for”.

“Moving on,”she says sharply to the whispers of the class.

“Another fun case to look at is one you have probably heard of, The Python. This Brazilian futa has the largest recorded dick size at a whopping 29 inches when fully erect, and a 19 inch when limp. She is currently 31 years old, and spends her time as a worldwide celebrity being pleasured by her harem of boys. I am sure most of the futas here can testify to her celebrity status”. The class oohed and aahd at the slideshow showing it. “While interesting and certainly beautiful to look at, her large size is a result of a genetic disorder cumulative in larger endowed futas. Very rare recessive gene that can be expressed twice”.

“Moving on to the male anatomy…” I zoned out, as I knew most of this already, but as she moved on to male pregnancy, i started to pay attention again. I didnt know much about the details.

A male has the ability to become pregnant with a futas child should he take a hormonal pill prior to insemination. It would stimulate his body to accept the sperm cells, or swimmers as they are called, and not absorb them as nutrients. The upper colon would then serve as a pseudo womb for the growth of the baby. During this male pregnancy, the male should be fed exclusively futanari semen, to accelerate growth of the child as well as feed the male, either orally or rectally. Even if the mother of the child is young and not fully developed, it is better for the male and the child to be fed from a more mature futa for the above mentioned reasons.

“Now, it is worth mentioning that one reason why larger sized futas are far more prevalent is that to inseminate a male, the semen must reach PAST the colon and into the large intestine, and be kept there for a time. Now, you can imagine why thicker and longer futas can impregnate males more easily. So their genetic material carries on more often than smaller futas.

Futas, larger or not, also have copious semen storage ejaculation capacities for the same reason. A massive futa that does not ejaculate much can have as much success as a much smaller futa that ejaculates enormous amounts per orgasm. Thus follows the trend.”

Woah, I did not know all of that. My stomach squirmed at the thought, and a strange heat came to my face. So weird to think about all of this happening to me.

“Alright, class, that is it. I will see you on Thursday for the next part of this, which is on behavioral patterns and differences between the sexes.” With a clatter of seats and bursts of conversation, the class enters a mass exodus towards the door, and I follow after grabbing my stuff.

Time for my next class.