>>11381133
>it's the only one that I can remember.
Indeed, which is why we desperately need more of it!
>>11381422
Although there are doujins that take place in settings where futas integrate themselves into the population and/or replace men as the dominant sex, there are basically none that deal with the "pseudo-science" of futanari, nor any that actually showed the process of futas assimilating into the population. It's a shame really, most people just want to fap to sex scenes. Being the autist that I am, reading about the pseudo-scientific nuances of futanari before getting to the main event would serve as excellent "foreplay" for me, and I am sure you feel the same. That is also the reason why I really love futa sperm stuff as well.
There is this one femboy doujin (no futas) that, while framed as a joke, contained something that I found very hot.
https://exhentai.org/g/907611/61c617d102/
>I will implant my DNA that contains my crossdressing fetish inside of you
The pseudo-scientific implication being that his "crossdressing fetish genes" would integrate themselves into his younger brother's genome, thus turning the younger brother into a crossdresser as well. I would absolutely love to see similar stuff to that in futa doujins.