Why are you not allowed to screw them in the first place?? Why need a patch to make it possible
Progeny count as your kids, screwing your kids counts as incest even if they are random orphans you found, patreon has a stick up their butt about that, the big banks are the ones that helped shove it up there, and some religious fanatics probably wrote that up while going "won't somebody please think of the children".
When the npc randomizer was still shiny and new the definition of lineage wasn't well defined, as the game coded it if they weren't a slave they were family.
So in short Patreon says don't screw the kids or they take the money away and a rough guess would be this game is somewhere in the $10K a month range.
As for why design a system like that in a porn game? The world may never know.
I get the your kids are your kids but everyone's kids aren't your kids or is this metaphorical where it takes a village to raise a kid
If you were just asking about progeny getting screwed by other men well that's less interesting.
The BF (Battle Fuck) system is rather old and used to be sprite based. It was coded so only the princesses would be involved because having the knight do it was bad somehow... A different time back then. Anything that didn't have sprite animations was filtered out which included all the extra progeny characters.
Most, but not all, sprite sex in RPG Maker VX Ace is derived from
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however given how the characters ballooned with the npc randomizer it wasn't practical to keep using these and it got switched to the video player.
So in short the BF system is old with a lot of dust on it and some rust in the gears. Likely to be expanded upon someday.