I forgot the name of it but i know it started with the word sweet. The main characters consist of a guy that mistakes a man for a girl and chases after him in a club/bar. In the same chapter the sister finds this guy and finds him hot, and we get some rivalry. One thing to know is that the 'top' is the one mistaken for a girl. And basically the 'bottom' would appear as a top. I will say again that the name of this manhwa(idk?) starts with sweet.
BOI WHAT IN THE HELL BOi? YOU MAKEOUT WITH SOMEONE ELSE, MATTHEW GETS HARD AD NOW YAL FUCKIN??? WHAT IN THE HELL BOI