I-- I just know there is a pwp perv minsung idea in this.

Jisung who knows he is hot shit, used to being lusted over, looked at, even in public toilets. Who develops the habit of picking up men in club bathrooms -- "what, you want to hold it?" he smirks when men not-so-subtly oggle his cock at the urinal.
A quick stall fuck here, wet mouth that is just a hole to be used there. He likes the attention, pathetic men tripping over themselves for a chance.
And then, the day that all changes. The one night Jisung meets Minho.
Minho goes to take a piss next to the urinal Jisung is using, and he is a new face -- Jisung hasn't seen him at this club before. His gaze lingers over the man's beautiful face, down his veiny forearms, his huge cock -- oh
"What?" Minho asks then, "Never seen cock before baby?" It's belittling, voice dripping with arrogance. "Or at least not one as big as mine by the looks of it" He smirks, looking at Jisung's average length.
The tone stirs something in Jisung. He takes Minho by the collar of his shirt.

"Bet you $200 I can make you come like you never did before, pretty boy"
Minho smiles something dangerous.
"Such a roundabout way of asking me to fuck you, sweetheart. You're on."