impregnated by goblin, you have to fail every check when you encounter her, and with naga, I can't remember. You can get impregnated by goblin and then go to naga to even have a baby naga goblin thing. Something I suggest is a butt plug to prevent it from coming out (goblin egg). The goblin has to be futa. Also the naga I think has to be the one you interupt her mating or something(playful i think).