Nonesuch has a orphan if you don't wanna start from scratch, probably gonna have to ask though.
EDIT: Forgot to add the link
https://docs.google.com/document/d/...Jx5IMj2303yqeTVJY/edit#heading=h.lkjv1jg5hmhq
I'll be honest, I think the Hippocampus Station is a terrible idea in general for three main reasons:
* It comes with forced feminization, hips size change which is a turnoff to me and a lot of people that like Mpreg. The only reason the feminization happens is because it's a fetish of the character in question and it's essentially that character forcing his fetish on people. It's also kinda weird to see a gay man forcing feminization. Forcing a second fetish on players that just want deal with the first fetish is in my opinion a terrible idea.
* The character in question is a racial supremacist and is doing his whole research for racial supremacist reasons. As we all known from the Ryia example that is effectivly Skub and it's again forcing people with the Mpreg fetish to deal with things they might not want to do. This in general is a terrible idea.
* Because male content is added at a very slow pace because of the personal tastes of developers, this means that if hyppocampus station get in, it would be likely be the only example that gets in. This mean that effectivly anybody that wants to taste Mpreg, would effecitvly have no way to avoid the above mentioned problems.
TL;DR: Hippocampus station is a terrible idea because of force feminization, a racial supremacy character and the very slow addition of male content making people unable to avoid the beforementioned problems.
Given that TiTS is full of all manner of reproductive oddities, such as the Bothrioc, the Bruchandus , and canonical examples of fertility medicine overcoming natural limitations... would it really be so lore-breaking or hard to implement an item to allow male characters to get pregnant by various non-ovipositor-wielding men, women and others?
To answer
@Quiet Browser question, yes there is. I wrote the Vulkrim Codex that is already in the game and canon. It does cause a few problems with Hippocampus station lore that can be easily solved by having the character reinforcing his racial supremacy.
To explain it further Vulkrim are a race of imp-like creature with scorpion tails. In the past they had females, but someone inserted a virus in the population that exterminated the females and altered the male tails into producing "mpreg juice". When injected into a large enough hole in a person, usually a anus it will create a "pseudo-womb" for a week that can be impregnated. If sucessfully impregnanted it will result in a birth in 8 months, if not the womb will just come off(or be absorbed back into the body? I don't think I specified which in the codex). The resulting child will not have Vulkrim DNA, unless a Vulkrim was the biological parent. The only physical change it does, besides the gravid belly, is increased elasticity in preparation for giving birth that disappears shortly after it.
In short I tried to write a mpreg system would be mechanically easy to implement without any of the issues that I found the Hippocampus station and without having to write pregnancies and births for every possible type of child. However I might also have made an indirect explination on why a Mpreg would be unviable as a product as a Vulkrim can already do the essentially the same for free.
The reason I haven't wrote it yet is because I commissioned a part that would have to go with it, but the writer has been having problems that I will not discuss further. However I wouldn't have problems with someone else writting it and sharing my notes on it.