Dude... I was creating a story for a game of mine, but I'm not going to do it, because it requires a lot of dedication.
The game summary:
Also about a goblin who was a slave to a witch, this witch goes on a mission with other women, a Ranger (bunny), a paladin and a warrior princess, this mission was to seek the stone of desire (this stone had the power to fulfill only one wish, it doesn't matter which one) the objective was to end the dark empire with desire, but in the middle of the battle the goblin takes the stone, but he wishes to be able to access the powers through lust, he does not control lust, but to gain some powers through, such as becoming physically stronger, healing and increasing the power of a woman who has any sexual relations with him.
The point I think you can use in your game is this:
It's about the evolution of goblins: the protagonist explains that goblins used to need to rape women to have children, but goblins evolved, because they realized that if human women had pleasure during sex it would be easier to have sex with them again.
1st Evolution: when goblin dicks are hard, they release a pheromone that makes human women excited.
2nd Evolution: pre-cum increases the sensitivity of a woman's vagina and anus.
3rd Evolution: goblin dicks have a texture that gives women much more pleasure.
These are just ideas that you might want to put into your game.
Congratulations on your game, friend, it is very beautiful, and with a wishing stone, I wish you success in the future.