Curate, connect, and discover
I happen to have the headcanon that Quark is actually a really good singer, but he just doesn't do it out in the open a lot. Like Rom knows about because they grew up together and heard him all the time, Ishka once told Quark that he could "earn a living worth of latinum" by actually pursuing it as a career, Nog knows cause Quark used to sing him lullaby's when he was younger, and Jadzia probably also knows about it because she caught Quark humming and singing to himself in the bar's storeroom one day.
Anyway, all this say that when Odo walks into Quarks on an extremely crowded and lively night to find a drunk Jadzia goading various members of the crew into karaoke he stays and sits down to watch only to be finds himself complete dumbstruck when an equally tipsy Quark starts singing a slow love song in an absolutely enchanting voice. Halfway through the song they lock eyes across the room right as a particularly lovey-dovey lyric comes up. Odo doesn't dare look away from the magnetic pull of Quark's hooded eyes and enlarged pupils looking straight at him. As the soft music swells all around them the room is suddenly empty, nobody but them between these walls and the vast expanse of space and stars. Odo starts to feel himself melt and finds that it's getting harder and harder to maintain his form the longer he watches Quark and the blush filling his cheeks and his tongue dash out to wet his lips and-
The moment is over as quick as it started.
The song ends, everyone claps and cheers, the night eventually ends and compliments are thrown left and right at Quark's singing abilities.
Meanwhile Odo's trying to figure out a way to simultaneously tell Quark he's never appeared more beautiful while still somehow insulting and degrading him without actually letting him know that Odo cares.