Severus weds Skyrah Riddle under orders from Voldemort. She's capable of showing kindness despite her cunning. Severus can't figure her out. The problem is she might unmask him before he unmasks her. Meanwhile, Voldemort pressures the couple into conceiving an heir. The last thing Severus needs is to teach Potter occlumency, but destiny has always mocked him. (Severitus, no slash)