It's yaoi. About rivalry between two adult man. In work and life(?). They know each from a long time (childhood?). And then thay got kidnapped, get tied together(?). And then they confess to each other. If i'm not mistaken there's a line when the seme said he want to become success(?) because when they are still a kid, the uke told that he hate poor people. And so the uke said he want to become charming(?), because the seme said he hates ugly people. AND they have sex there, just when the kidnapper caught them. Sorry for my bad english, it's hard for me to remember .

It sounds like "Paper-Thin Loathing" (Chapter 6) by CJ Michalski. And your English is very good!

it was a yaoi manga i read many years ago, so i forgot. Luckily you answer it, thank you.

You're welcome! You may have forgotten the title, but you still remembered enough detail to accurately describe the entire plot!