only a book and accompanying scott from pentatonix's scott hoying can turn a quiet barnes & noble intousband inspiring their children's book, "how lucky am i," about two mayflies. >> we were cooking together and i accidentally trapped a fly in the freezer and mark being the angel he is, he's always like this, we must set it free. they don't live that long. how long do flies live and saw that the mayfly lives 24 hours exactly, the shortest living creature on earth. >> reporter: spending their one precious 24-hour life together exploring the world and falk in love. >> the mayflies in question are based on the two of you. >> they have the little qualities of us, like the little hair. >>> the blond haired one is me, here's one with a beauty mark right here. >> blue eyes, brown eyes. yeah, yeah. >> reporter: their wedding vows even woven into the story. let's adventure side by side, we'll talk for hours, laugh and cry. >> your vows. >> ah. >> i remember the way he looked when he was reading them. i was so emotional. >> reporter: as their one-year anniversary approaches they hope the book wi