>>3076957

>I saw this >>11348066 in a Mpreg thread on /d/ writing Lore based off this Danzi Engine video

I'll copypasta:

1.
>I like the idea of Mpreg making you more Masculine

Some world-building/speculative biology based off Hentai vid by Danzi Engine https://rule34video.com/video/3283419/saka-45/

>Homo-unisexual, offshoot of Homosapian

They produce only the Male Sex, as a result their reproductive cycle relies on the metamorphosis from a Beta to an Alpha

Betas "brats" are the first stage of their adulthood/sexual maturity. They fill the role of breeding stock for the Alphas, possessing vaginal cavity & womb inside a secondary cavity in the rectum. They are inferior in size & strength to Alphas, but these Betas are No "fembois" resembling "Twunks" possessing a slender but slim muscular form with visible abs. They posses No body hair. Ranging in height 5'10"-6'1" & weighing on average 180-200lbs.

At Age 19 the Betas will start their first Heat cycle in which their already over sensitive rectum becomes inflamed, the vaginal channel opens, allowing them to become Pregnant. The large Homo-unisexual prostate that naturally lubricates the anus when aroused goes into overdrive leaking a small trickle of pre.
They release pheromones that act as an aphrodisiac to Alphas. During the Heat, Beta's Saliva & pre & unvirile cum acts as an even stronger aphrodisiac to Alphas (& of course the Alphas scent & saliva does just as much for the in Heat Beta)

This lasts for 12days every 3months til impregnated. The Heat Will begin again after 5yrs

Betas will continue this cycle until completing 2-5 pregnancies. After their final pregnancy they hit a 2nd puberty & morph into Alphas

Betas keep at their sexual prime during their breeding years, resembling a Human male in his early 20s even as a "late blooming 5th pregnancy about to be Alpha" at age 45.