I apologize in advance because I’m not really giving you an answer but instead a quest.
I searched the tag “Social Media” and a bunch of results popped up. Also searched “Model” in case social media was too narrow. What you’re looking for is likely in one of those somewhere.
https://www.mangago.zone/tag/Social%20Media/
https://www.mangago.zone/tag/Model/
That being said, you can breeze past a lot of them if you can remember if it’s a Webtoon or a manga. Even better if you did mark it as read/now reading/want to read.
Unfortunately, I don’t think you can search multiple tags at once, but if you remember something else you can search that instead.
You can also try to find it, if you can remember the art well enough, by just looking at the images. Just try to keep the art style you’re looking for fresh in your mind as you go. Otherwise your eyes get used to scrolling, stop looking, and breeze right past it. Spoken from experience.
Lastly, I wish you the bestest of luck if what you’re looking for is old yaoi, and not the main story, and/or a mere Oneshot in a Oneshot compilation. I’ve basically given up looking for one like that because it’s so hard.
Sorry again for it being a quest and not an answer. Hopefully someone else knows it, but if not there is a quest for you.
I just typed ‘model x influencer’ into the tag section and found this
https://www.mangago.zone/read-manga/tsuyoki_na_dotei_ha_etchi_ni_yowai/
I haven’t read it, but I saw a comment where it mentions the quote you talked about. Is it maybe this?
I just checked it out and I think it might be the one you’re looking for!
Hello, I've been looking for this manga for YEARS now please if u know u could save a life
theres this bl manga ive read but cant remember it very well but its basically a uni student guy and hes the most handsomest at his school. Hes always posting himself on social media and hes always blowing up, but he hates when people tell him to sign up for modeling. Then the ml is a model whose indisguse and basically attends the same uni but people dont realise its him, as some studnets r obsessed with him.
The mc says the model 'isnt all that, and looks like hes bad in bed' the ml overhears him..then story continues. help