Dude... If I am correct about where the dessert is, than it is accessible from the "Sultry Plateu" (where the wild catgirls are). That means that you need a keystone to open the gate from the plateu to the dessert. but to get to the plateu, you need a keystone AND to complete a quest for the Bee Queen so that she removes the honeycombs from the gate (she will also give you a keystone, so at least there's that). But to get to the bees, you need a keystone, and clear a quest for the butterfly girl in the pleasure pastures (she too will give you a keystone for it). And to get to the pastures, you need a keystone... so you need to either steal one from the slime lady (which will make her cry and you will be unable to interact with her for the rest of the playthrough) or you can do the quest for the centaur girl near the gate to the mountain area... The amount of work and backtracking to get the fast travel is almost on Dark Souls level with this game...