itch.io

From my experience of making NISHY pregnant in FREEMODE, NISHY can't give birth to FAPET, and one of the eggs will become unhatchable (failure) and the other one will become a tentacle RAPE NISHY.

I'd like to ask the original author for the correct answer.

Indeed, Nishy can only be impregnated on Free Mode, but she will not bear a Fapet nor a Human offspring. 

The main reason is explained when Yuri meets the Parasite Lamia at the beginning of the game

@Ayasenanako , @MartPriest I confirm that these answers are correct, Nishy cannot bear a fapet child because of her parasite infection (which happens on first chapter of story, this also being the cause of her body adapting for oversized and more hardcore h poses).

I hope this helps ;)