I need to actually write it up (which is effort), but, I've been kicking around a plot idea based on a Tumblr shitpost about swanmays and the lack of sexual dimorphism in swans, with a heavy dose of role reversal and subverted tropes. All in an "urban fantasy" kind of setting. Fey are known to exist but generally are distrusted and keep their distance from humans. Information on them is sparse and often wrong.
Like, y'know, assuming all swanmay are female.
Take the usual swanmay/selkie story about someone stealing the faerie's shifter skin, and interrupt it. MC stops an attempted kidnapping and rescues the swanmay and just like, has this passed out swan, and figures she'll take her home and tuck her in on her couch and drive her back when she wakes up. She's expecting like, a 5'0" faerie woman to pop up on her couch, but comes home from work and finds a massive 6'2" hunk of a man there instead, because swans are jacked and in swan form the males and females are identical.
And he's just flabbergasted she rescued him, and is hell-bent on repaying the favor (because faeries are big on debts and favors), and he offers her all sorts of stuff including marriage because that's what he knows he's supposed to do, and she's like "yeah your faerie castle doesn't have internet, I'm good here, I guess you're tall could you change this light bulb and we will call it even and I'll drive you back? Also you should really put on a blanket because you're Very Naked and Very Good Looking".
And this big himbo of a faerie just falls head over heels for her and the RP is a mix of her figuring out what she is supposed to do with this literal prince following her around like a lost puppy, and figuring out her feelings for him, and also a bunch of political faerie stuff that'll come up because it turns out there were reasons he was being kidnapped and he's a goddamn prince and Some Shit is happening.
And, of course, add in the fact that MC is really not into conventional ideas of relationships or sex (see: my usual penchant for writing "kinky femdom pegging shit").
Ugh, I should write this out into proper prose...