Prologue
Hermione woke up and touched her head immediately. Evil headache. It took a second for her memories to come back. Class reunion at Hogwarts after ten years. She had celebrated with the boys, even if she met Harry and Ron quiet often but finally to be together with everybody of Dumbledore's army, lead to a very drunken night.
And to all appearances she ended up with somebody, because she didn't even know this bedroom approximately. One look under the bed sheet made it clear that she didn't just stay out late boozing. She was naked and moving carefully she could feel the dried body fluids between her legs. That could only mean one thing: She had had sex last night.
She glance at her side and her shocked reaction was to jump out of bed and get dress as fast as possible. She tried to be quiet and sneak out of the professor's bedroom and his habitation. With the sound of a closing door she took a deep breath and made her way to the apparation point to disappear into thin air and return home.
She had had sex with Severus Snape. With Snape.