to do the tentacle quest you have to be Eliza’s lab assistant after doing so many tasks and such and i think dealing with that one white wolf futa (I forget her name) and complete her story (to the point where she gets egged by plant tenticles) does Eliza start dealing with tentacles and such, i think.
you can make the quest complete by buying it with credits or you can go into slavery and get egged by tentacles and bring the eggs with you after slavery to either lower the price or give so many eggs that you don’t need to pay