After the judge finishes the ceremony and announces that I may kiss the bride, I move closer to her. I had only planned to give her a chaste kiss, but my eyes catch Sarah’s. She’s watching me with a smug, mocking smile, as if daring me—you won’t really kiss her, she seems to say. Without thinking twice, I close the gap and press my lips to my new bride’s.

Caught off guard, she gasps. But her soft, full lips fit perfectly against mine. I deepen the kiss, tangling my tongue with hers, ...