Joushi to Ore no Himitsu

Nagato Hiroki got drunk in college and made a mistake one night with a guy he'd never met. He's learned his lesson from the humiliation of being taken by a man and changed to a plainer image so that he isn't recognized by that man in case they ever meet again. Since becoming a working man, Hiroki hasn't been drinking or playing around, resigning himself to a serious and quiet existence. However, one day, he realizes that the high-powered man assigned from the head office as his new boss is that man, Kurosawa Naoya – and his peaceful, ordinary life takes a sudden turn. Kurosawa says he's been looking for him, and though Hiroki desperately tries to deny it, he's confronted with proof that they slept together: a mole in an intimate area that even he didn't even know about…?!