Sophie Metternich question.

Hey everybody! I've got a question regarding the character Sophie Metternich. It's been a long time since I last saw this series on Sci-Fi but I need to know something: didn't Sophie have a relationship with one of Helsing's nephews? The last episode I remember was seeing her kiss the oldest boy, (I think it was Max, I'm not sure) but he had sprayed something into his mouth first before Sophie kissed him and then she started to seize up. That's all I can remember but if anybody knows the exact details, please post.