This Needs To Stay Our Little Secret, Daiki...! -My Handsome Boss Is Also A Huge Hornball!?-

Shiori Izuki, who at first glance seems like a typical office worker, has a secret. She really loves adult comics for men. She desperately hides this secret, which would ruin her reputation were it to get out. One day, though, her handsome boss, Daiki Nakatori, finds out. Of all people, it would have to be her perfect boss! Shiori despairs, but he shows a surprising amount of understanding. The two then share a drunken moment. However, it seems that Daiki has a secret of his own...

(Source: MangaPlaza)