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[Other] Fertility Framework

mystic_cat

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mystic_cat

mystic_cat

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Fertility Framework

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support_me_on_kofi_blue.png (980×198) 

Fertility Framework Discord: https://discord.gg/ufuffAeBAq               

The discord has roadmap, development progress, ability to request features, etc.                                                      

Fertility Framework (Beta Release)                                                                                                                                                                 

Welcome to the Starfield Fertility & Xeno-Incubation Framework. This mod is a complex, background state-machine that tracks your character's biological fertility cycle in real-time. It operates seamlessly in the background, handling everything from standard human pregnancies to deep sci-fi xeno-parasite incubations, complete with dynamic body scaling and custom companion integrations. It currently only works for a female player character. 


Required Dependencies: 

  • SFSE
  • Cassiopeia Papyrus Extender
  • XenoMasters

 

Optional:

  • SFF Body Replacer

 

Installation:

  1. Drop the contents into your "..steamapps\common\Starfield\Data" folder or install using Vortex/MO2
  2. Be sure that you have loose files enabled. Put this in your StarfieldCustom.ini if you don't already have it. 
    [Archive]
bInvalidateOlderFiles=1
sResourceDataDirsFinal=

 

 

1. ⚙️ Core Mechanics & Features

The framework actively tracks Universal Time (UT) and seamlessly transitions your character through biological states using highly optimized background scripting.

 

A. The Cycle & Pregnancy Engine

  • Biological Phases: Automatically cycles through Menstruation -> Follicular -> Ovulation -> Luteal phases.

 

Phase Base (No Mutation) Stage 1 (Compatible) Stage 2 (Adapted) Stage 3 (Broodmother)
Menstrual 72 hours 72 hours 72 hours 72 hours
Follicular 144 hours 120 hours 96 hours 60 hours
Ovulation 72 hours 120 hours 168 hours 240 hours
Luteal 144 hours 120 hours 96 hours 60 hours

 

 

  • Insemination Tracking: Hidden scoreboards track cumulative volume (up to 1000mL) from sleep events and interactions, decaying dynamically over time.
  • Gestation Progression: Successfully transitioning into the Fertilized state triggers a UT timer that progresses through Three Trimesters, culminating in Labor and a postpartum Recovery phase.
  • Dynamic Lactation & Pumping: Triggers during the 2nd Trimester. Milk volume continuously generates (up to 1000mL), shifting your status between Producing, Full, and Engorged. You can now use the craftable Manual Breast Pump consumable to physically reduce your volume, clear the Engorged debuff, and yield usable Breast Milk items.
  • Xeno Pregnancy Tracking:

 

Phase Stage 1 (Compatible) Stage 2 (Adapted) Stage 3 (Broodmother)
Fertilized 24 hours 12 hours 3 hours
First Trimester 96 hours 72 hours 48 hours
Second Trimester 96 hours 72 hours 48 hours
Third Trimester 96 hours 72 hours 48 hours
Labor 12 hours 12 hours 12 hours
Recovery 72 hours 24 hours 24 hours

 

B. The Xeno-Incubation Track

  • Mutation Phases: Tracks repeated xeno-exposure, mutating the womb through Compatible, Adapted, and Broodmother stages. Higher stages drastically increase xeno-fertilization RNG and alter cycle durations. Currently, sleeping with a xeno pet deployed while the player is 'Ovulating' will trigger insemination events (until we can get some animations). After 5 insemination events, that will trigger womb mutation.
  • Live Xeno-Births: Completing a xeno-labor cycle will dynamically spawn a friendly, scaled-down creature matching the specific alien "Father". We have baked in explicit, native support for Terrormorphs, Heatleeches, Ashta, Xenogrubs, and Swarmlings. Pregnancies from these specific species will render dynamic, custom xeno-uterus graphics on your UI status widget. Unrecognized or non-mammalian alien fathers will default to an "Egg" pregnancy on your widget, resulting in the player laying a warm, incubatable Alien Egg.

 

C. Mod Integrations

  • XenoMasters Native Support: Includes a built-in, dynamically injected dialogue patch for the XenoMasters mod. You can approach your active companion pets (or stationed outpost pets) and select the [Mate] dialogue once your character's womb starts to evolve to be compatible with xeno.

 

2. 🌟 The Visual Morph Architecture

No more proxy items or invisible armors. The framework now utilizes a native, "Infinite Resolution" scaling system. By bypassing standard equip limitations and utilizing pure Papyrus math, the Morph Manager seamlessly scales belly and breast sliders by micro-decimals every single in-game hour. Your physical 3D mesh will dynamically and organically inflate/deflate in real-time to match your exact pregnancy progression and milk volume without ever cluttering your inventory.

 

3. 🗺️ Development Roadmap

With the core biological engines, visual morphs, and XenoMasters integration complete, the remaining focus is on player control and expansion:

  • Configuration Holotape: A craftable in-game tool to toggle specific framework features, adjust cycle durations/RNG chances, and view hidden statistics (like Total Xeno Births).
  • SAF Integration: Hooking framework milestones into the Starfield Animation Framework.
  • Expanded Consumables: Additional ingestibles like Forced Ovulation pills and cycle-altering suppressants.

4. 📝 Testing & Feedback

While testing this beta build, I am specifically looking for feedback on:

  • Morph Pacing: Does the hourly micro-scaling of the body morphs feel smooth during standard gameplay?
  • XenoMasters Integration: Are the [Mate] dialogue options appearing correctly for pets across different active slots and outposts?
  • General Pacing: Does the Universal Time (UT) math feel balanced for a standard playthrough?

 

 

4

Temmerian

Temmerian

Posted
Posted (edited)

Looks like I have everything but SFF, I had been using BBL but since that is just morphing the vanilla body, looks like I will need to change over, I had been using Body Morph Console with BBL to morph the vanilla body into different shapes and sizes but looks like SFF works with BMC too, so likely can do the pregnant body shape I was using for one of my RP characters who got a bit too close to one of the non-constellation crew as the constellation crew are too cookie cutter for her..  LOL.   

Assuming this (the availability of morphs, including a pregnant one with BMC) is why you are using the SFF body as it seems to have a good collection of things made for it now too.  Will give this mod a try once I've rebuilt my load order for the new body as I have texture mods and a range of things to change.  Glad someone is working on a fertility mod, it's taken the game some time to build up into something but I believe it has potential.  

Edited by Temmerian
mystic_cat

mystic_cat

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  • Author
Posted
5 hours ago, dertcz said:

Missing in requirements: Heatleech Parasite Outfit

Thanks for the catch,  I forgot I was using that for testing the implementation of decreasing milk volume when wearing clothing items. That way you can have wearable xenos/babies.

cappearson

cappearson

Posted
Posted
26 minutes ago, Fredfish said:

MO2 is complaining that Fertility Framework is a .esp. Is it okay to ignore this?

I can't believe this is the thing that brings me out of lurking but no you should not ignore that and @mystic_cat needs to save it as .esm before publishing. .ESPs were always the "working file" format in Bethesda games but we got off light and it never caused issues until Fallout 4 and *especially* in Starfield.

Loading .esp files in Starfield can cause numerous issues. Missing textures and landscapes were the most noticeable, I don't know if anyone has done further deep testing because it's really just easily avoidable and publishing as .esm was always the best practice that just went ignored for too long.

mystic_cat

mystic_cat

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Posted
49 minutes ago, cappearson said:

I can't believe this is the thing that brings me out of lurking but no you should not ignore that and @mystic_cat needs to save it as .esm before publishing. .ESPs were always the "working file" format in Bethesda games but we got off light and it never caused issues until Fallout 4 and *especially* in Starfield.

Loading .esp files in Starfield can cause numerous issues. Missing textures and landscapes were the most noticeable, I don't know if anyone has done further deep testing because it's really just easily avoidable and publishing as .esm was always the best practice that just went ignored for too long.

I'll reupload this as an .esm when I get back to my computer. This is news to me and I'm quite new to modding. Thank you!

Agroz

Agroz

Posted
Posted

Genuine question, and feel free to reply or not- are you planning on adding mpreg (male) support? Thanks in advance.

mystic_cat

mystic_cat

Posted
  • Author
Posted
31 minutes ago, Agroz said:

Genuine question, and feel free to reply or not- are you planning on adding mpreg (male) support? Thanks in advance.

I'm not opposed to it. Some of it will depend on what's possible with the body meshes, and it would be easy to incorporate with "certain attacks causing parasitism". 

1
Agroz

Agroz

Posted
Posted
38 minutes ago, mystic_cat said:

I'm not opposed to it. Some of it will depend on what's possible with the body meshes, and it would be easy to incorporate with "certain attacks causing parasitism". 

Thanks for the reply! I'll be keeping track on the good work!

Rebecca1117

Rebecca1117

Posted
Posted
11 hours ago, mystic_cat said:

Thanks for the catch,  I forgot I was using that for testing the implementation of decreasing milk volume when wearing clothing items. That way you can have wearable xenos/babies.


I feel like im missing something. I cant, for the life of me, find the heatleech outfit mod anywhere. can you help me please?

mystic_cat

mystic_cat

Posted
  • Author
Posted (edited)
8 hours ago, Rebecca1117 said:

Thank you for the fast response. I've been eyeballing the progress of the mod, is there a group or server i can join for more info maybe? Like possibly a discord?

Thank you again.

I could look at setting up a discord server if that's something that people would be interested in.

 

 

1 hour ago, InterGalacThicc said:

Will it be possible to use without any xeno/parasite mods installed? I am mostly interested in any breast milk related stuff. Also, i use MWV body, will this be SFF exclusive only? I guess something that I hope for is an option to ask crew members for milk or be able to buy and drink it from the stores even if the morphs won't work for all bodies.

My intention is that it won't be specific to just SFF Bodies and that you could use the mod completely without any of the xeno/parasite stuff. Since the next thing I'm working on is an interface to control some of the settings for Fertility Framework, some of that could start to be in the next release. That's why I wanted to upload the mod on here and see how much support/feedback I could get. I have a fulltime job so I want to be sure a mod/framework like this is even wanted before I dump more time into it.

 

I essentially started this mod for myself, but while also keeping in mind that it could be built out to incorporate a lot of the elements of 'Fertility Mode', 'Milk Mod Economy', 'Family Planning', and 'Wasteland Offspring'.

Edited by mystic_cat
3
ReverendD

ReverendD

Posted
Posted (edited)

 

On 4/12/2026 at 1:06 AM, mystic_cat said:

select the [Mate] dialogue option to trigger

 

Couldn't get the xeno companion to display this dialog option, not really sure why.

 

I also don't see any of the information under the status window, shown in the screen shots, so I'm guessing I've just installed this wrong. Are there any other requirements I might be missing? I snagged all the mods listed as required, and as far as I can tell all of them seem to be working I just don't see any of the features for this mod. 

 

I haven't used the Xeno mod before, but I was able to capture a random critter, then summon it, but all the dialog appears native to that mod once it's summoned. I assume we just talk to it and the [Mate] dialog should be one of the options, such as adjusting their follow distance?

 

I'm on the latest version of Starfield that just dropped, not sure if that's the version I should be using.

Edited by ReverendD
mystic_cat

mystic_cat

Posted
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Posted
35 minutes ago, ReverendD said:

 

 

Couldn't get the xeno companion to display this dialog option, not really sure why.

 

I also don't see any of the information under the status window, shown in the screen shots, so I'm guessing I've just installed this wrong. Are there any other requirements I might be missing? I snagged all the mods listed as required, and as far as I can tell all of them seem to be working I just don't see any of the features for this mod. 

 

I haven't used the Xeno mod before, but I was able to capture a random critter, then summon it, but all the dialog appears native to that mod once it's summoned. I assume we just talk to it and the [Mate] dialog should be one of the options, such as adjusting their follow distance?

 

I'm on the latest version of Starfield that just dropped, not sure if that's the version I should be using.


So currently, for the [Mate] dialogues to appear for xenos you have to already have the mutated womb. Since the animations are still missing, I should probably unblock the [mate] dialogue option or add a drug to force that. The thought being, the player would gradually start to mutate from interactions with Xenos. The further the womb mutates, the higher the fertility rate with xenos and the less fertility with humans, etc.

To get around it, once your character is ovulating just sleep 5 times with your xeno pet deployed. That should trigger 5 'insemination events' that should trigger the 'womb mutation'.

The Secret

The Secret

Posted
Posted
1 hour ago, mystic_cat said:


So currently, for the [Mate] dialogues to appear for xenos you have to already have the mutated womb. Since the animations are still missing, I should probably unblock the [mate] dialogue option or add a drug to force that. The thought being, the player would gradually start to mutate from interactions with Xenos. The further the womb mutates, the higher the fertility rate with xenos and the less fertility with humans, etc.

To get around it, once your character is ovulating just sleep 5 times with your xeno pet deployed. That should trigger 5 'insemination events' that should trigger the 'womb mutation'.

A drug to force that is pretty much the Alien DNA Trait. In game lore, there was an experiment that combined alien and human DNA, even though we, the players, never see it. May I suggest changing that trait to fit Fertility Framework and the drug as the one being used in those "controversial experiments".

mystic_cat

mystic_cat

Posted
  • Author
Posted
1 hour ago, The Secret said:

A drug to force that is pretty much the Alien DNA Trait. In game lore, there was an experiment that combined alien and human DNA, even though we, the players, never see it. May I suggest changing that trait to fit Fertility Framework and the drug as the one being used in those "controversial experiments".

Ohh, I like this idea. I'll look at incorporating this, and thanks for the idea ❤️

1
Rebecca1117

Rebecca1117

Posted
Posted

Me again. I cant seem to get everything to work and believe there may be an issue with SFSE due to me kinda maybe using an illegitimate copy of starfield. Is there a way to circumvent the issue as it claims it doesnt load properly?

Rebecca1117

Rebecca1117

Posted
Posted

i forgot to add this to the reply and dont know how to edit. But is there maybe a conflict with the NAF seduce/ surrender mods too? I know there probably isnt because its the SFF menu in character creation saying things are unloaded. 

Heres an image link, but it wont let me insert
https://ibb.co/8g3kwrDX

mystic_cat

mystic_cat

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Posted
20 hours ago, Rebecca1117 said:

Thank you for the fast response. I've been eyeballing the progress of the mod, is there a group or server i can join for more info maybe? Like possibly a discord?

Thank you again.

Per request, here is a discord I setup for this mod. 
 

https://discord.gg/9jpHcdXR

1
Rockvell

Rockvell

Posted
Posted
10 hours ago, Rebecca1117 said:

Это снова я. У меня никак не получается заставить всё работать, и я думаю, что проблема может быть в SFSE из-за того, что я, возможно, использую нелегальную копию Starfield. Есть ли способ обойти эту проблему, так как игра сообщает, что не загружается должным образом?

 

10 hours ago, Rebecca1117 said:

Это снова я. У меня никак не получается заставить всё работать, и я думаю, что проблема может быть в SFSE из-за того, что я, возможно, использую нелегальную копию Starfield. Есть ли способ обойти эту проблему, так как игра сообщает, что не загружается должным образом?

Have you run LOOT? You can use it to find out why your mods aren’t working

Rebecca1117

Rebecca1117

Posted
Posted
2 hours ago, Rockvell said:

 

Have you run LOOT? You can use it to find out why your mods aren’t working

I have not. im assuming the load order optimization tool, right?

 

Ill try that when I get back from classes for the day. 

Thank you very much.  

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