"And you're barren now because of it." Severus wanted to comfort her as he realized this, but something was niggling in the back of his mind. "No, that's not it. You quit taking the potion months ago, after The Dark Lord took away his..." he didn't want to say that out loud, "but then your bond transferred to Hermione,and you strengthened it after St. Mungo's... the latent healing should have repaired your womb as well." Severus raised his wand to cast a diagnostic charm, but Narcissa put her hands upon his.