Yaoi manga about coworkers who work in convenience store

Hi, I'm looking for an old yaoi manga about coworkers who work in a convenience store. The MC is the manager and he has two coworkers (a guy and a girl) who are in high school. His two coworkers are also going out but the MC (uke) and his male coworker (seme) are secretly sleeping with each other. It turns out the coworker has been really in love with the MC the whole time and he refuses to sleep with his gf and later dumps her and she quits her job at the store. I also believe they use the condoms they sell at their store for sex.