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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).
The easiest way to get goblin eggs is to lose to the female goblin, then fail all of the endurance checks. Once you're egged, they can become fertilized by centaurs, werewolves, harpies, or nagas. There is a special naga encounter (naga cave in) where you will be kept by the naga for the duration of the pregnancy