Nail File in coworker's bag

Does anyone remember an old yaoi manga about a straight guy and a coworker rumored to be gay. The gay coworker took out a nail file from his bag to help him with something, and he wondered if gay guys always carry these things. Then the gay coworker hinted that it's to keep nails short for fingering/prepping.

This was manga from quite a few years back, like 2017 and before probably