The issue I have with writers doing a "plus-size reader being insecure, so sex is the solution" trope is that it just sexualizes us. Insecurity can also stem from sexualization, just like it can from rejection. Plus-size people face objectification every day, and you're a part of it. It's also so unrealistic; if I'm feeling insecure about my body, the last thing I'd want is someone groping my naked body. Imagine if you were really thirsty and instead of someone giving water, they spit in your face and say, "Well, it's a liquid." That's what y'all are doing with those fic tropes. You're saying, "Oh, you have insecurities? Here's a fic about you getting your puss ate." Also, 99% of these authors who write plus-size characters like that are not plus-size themselves. So, instead of doing research or even talking to a bigger person, they write a crappy, half-assed fic that they think is so different. They praise themselves like they're fucking Liberace. I can give you a quick outline of these fics.
•reader tries on dress
•reader is insecure
•character comes in
•reader cries
•character and reader have sex.
You're like everyone else who treats us like we are not more than our bodies, you're just doing it in a performative way. You're not different, nothing you're doing is new, and if I'm being honest every insecurity->sex fic I've seen has been fucking trash.