Every year the nature goddess is blackmailed by their leader into being the one who is your wish provider. For all the favours you do for the goddesses and the forests, you get to pick one goddess a year to have your way with and get them to do whatever you want. Once you found Luna, you couldn't stop coming back for more. You get her to ride a thick cock deep in her ass for the first time. There's more to follow (see parts 4 and 5)