Comforting Light (слэш)

As a child, you’re given a toy that is bound to you and your DNA. They have lights in the middle that guide towards your soulmate. As children grow, the light naturally becomes a great comfort to them. It shines with a purple colour when their soulmate is alive and glows green when they are near. If the light goes pink, their soulmate is ill. And no one ever wants to see the light go dark red, or black, for that means their soulmate is surely dead.
But how would Sherlock Holmes deal with such a thing? Would he ever resent it? Or would he embrace it? And in a world full of people embarrassed by their toys, would he ever find his soulmate?