I want to fill at least one psl from my journal. All of my lines involve surrogacy or pregnancy in some way, usually along the vein of body horror. I'm not one for pure fluff. The idea I really want right now would involve playing with ideally a not modern time period and dryads. Past that it could branch out a number of ways.
Depending on who plays what role, Emma/William's history could be any number of things. Someone who was cursed, someone who brought down a powerful being's wrath, someone who made a really big mistake, someone with supernatural origins who is a supernatural creature of another kind. Timeperiod and Emma/William's backstory would be a building point to build on to figure out what unknown link the Dryad has to them. I do imagine the Dryad to have a level of memory loss from before they were a Dryad. Maybe they were human once. This could go a lot of ways.
Dryads are referred to in myth as ladies of the trees, literal spirits inhabiting or linked to a tree or grove. When Emma/William moved to a small farmhouse in the middle of a glen, putting all of their finances behind it, they were unaware that there was one such creature there.
The dryad in question is linked to a grove of fruit trees that are essential to Emma/William's harvest. When the trees bloom, she's energetic and happy. When the fruits ripen, she looks like she's with child. How well the harvest is doing impacts it. When the fruit is harvested, things return to normal and the dryad enjoys the autumn season. When winter comes, the dryad is severely weakened. If the trees die, so does she. If the dryad dies, so do the trees. Emma/William has no idea what to make of this creature, especially once the dryad starts to become curious about the human who moved to the middle of nowhere. Emma/William needs the harvest, so there's no getting rid of the dryad. Worse, Emma/William has no idea what to do about the threats they thought they had left behind coming for them, or how the dryad might be a creature cursed there for reasons tied into their own history.