"It’s a rare phenomenon, to be sure, but with wizards as magically powerful as us ..." Tom replied, gesturing to himself and Harry and trailing off leadingly. "It’s the same reason our wands connected whilst dueling last year. You recall hearing about that?" Malfoy nodded. "Soulmates cannot fight each other, and so our wands connected as a manifestation of our bond. Naturally, as soon as we realized our soul bond we began courting. We merely wished to keep it quiet until Harry turned of age, but he was so excited he let it slip." Tom gave Harry a fond look, and several onlookers sighed dreamily.