"We should talk to Rose, maybe find out if she knows anything" Hermione mused thoughtfully. "I don't think she is involved." She added hurriedly as Harry scowled, he had become fond of his ex-sister, bonding easily. "But if she thinks it is a normal potion then she might know when he started taking them and noticed the changes not knowing what it actually means." Harry nodded, easily accepting his twin's reasoning.