Kakushitagari no Douki-kun

A hardworking office lady with a huge love for lean, muscular men spends her breaks flipping through magazines, admiring well-defined physiques. But her blissful muscle-watching is always interrupted by her nagging coworker—an annoying, slim, and bookish guy who’s never been on her radar. That is, until one night at their usual work gathering, when a series of unexpected events reveals his shocking secret… Beneath that nerdy exterior is a dream-worthy, perfectly sculpted body! Overcome with curiosity (and maybe a little obsession), she can’t help but blurt out a bold request! (Source: Pixiv Comic, translated)