Ahhhh! This is such a good question I assume you meant kink tropes? In no particular order:

Immobility Aspirations/Immobility play
I do read/would write actual immobility but I absolutely adore the struggling final days of mobility. The discussions around it or lack thereof 😏. I think I’m such a fan because it can fit any tone you can make it loving and fluffy or dark depending on your mood. While I don’t think it’s something I’m particularly good at, I adore writing kink introspections and this trope is perfect for that give me a character horny rationalizing away any of their or their partners concerns.

Fat = ✨Gender✨
This broadly covers a whole bunch of my faves: Transitioning via obesity, Feminisation (forced or otherwise), breeding kink stuff. There is just so much fun to be had in terms of “No Gender only Fat!”
See my obsession with Ferdinand and Cherry for examples of this.

Under negotiated kink!
Listen if they are fucking and/or feeding each other instead of having a clearly needed conversation I’m all over that. I love it in terms of unhealthy coping mechanisms etc. Also characters slipping into D/s roles in the heat of the moment and they absolutely should stop and have a discussion but they aren’t going to. I also love this tied with mobility issues. I adore overzealous Feeders that are just like “Of course my Feedee wants to be bedbound, we don’t have to discuss it!”

Anything Feeding related
I feel like this is a bit of a Duh! but it’s just so good I (unsurprisingly) really like good and like reading about it. I also love writing about/describing food! I think writing wise it can be so useful for characterisation, why that food stuff? Why that kind of feeding?
Example: Matchablossom = Pasta 😋
I also love the different kinds of feeding. Is it a lazy Sunday morning stuffing in bed? Soft and sensual. Or is someone’s mouth being held open while tears stream down chubby cheeks?

Belly/roll fucking
Does what it says on the tin really! 😂
I just love it so much!