Snape shrugged. "Perhaps. Or perhaps that, coupled with an existing fondness for the man, was enough. As you know by that marriage bond you formed in a display of resourcefulness, or so I hear, magical bonds are easily forged, but not so easily broken. Almost never, in fact, without dire consequences. Magical bonds only grow stronger. As you latched on to this fantasy of Sirius Black, your interest in him grew stronger. And as the bond increased, so did the turmoil of reaching across worlds."