They'd been drunk. More specifically, his boss had been drunk. So when Sakamoto jumped him, Kurahashi just went along with it. After all, it was just the alcohol, right? Wrong. At least, that's what his boss thinks, and said boss doesn't have a problem with trying out a relationship with a colleague he thinks is in love with him. Unable to gainsay him, Kurahashi gets dragged into a relationship he never asked for - and he finds himself getting deeper than he ever imagined. From Storm in Heaven:

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The most beautiful princess of the lunar capital, Princess Kagayaki, is sent to the human world for making unreasonable demands on her suitors and causing trouble in the capital. A young man Asahi saved her from bandits, and she's told she can return to the moon if she completes the tasks on a scroll. As she struggles in his village, she becomes attracted to his kindness. But as the day to return to the moon draws near...