Looking for a yaoi manga... Again...

I can't bookmark stuff for shit. I will resort to my fellow fu-joshi/danshi for help. I can't remember if it was a long manga or a one shot but basically there's two boys in the same class that don't really know each other, but one day, the same accidentally sees the ukes wearing a bra, and they just kinda end up doing some smexy stuff as time goes on. I can't really be more specific than that xD thank you awesome people if you know what I'm talking about ლ(´ڡ`ლ)