Dimittite et Dimittemini (джен)

“I must not have heard you correctly, Headmaster,” Severus said flatly.
“You did, my boy. This isn’t only a favour to me, you understand.”
“But there must be trust," Severus insisted. "A bond… or some sort of relationship between mentor and pupil for Occlumency to be taught correctly! The only bond the brat and I share is one of mutual loathing.”
“Now, Severus, you are an adult and a Hogwarts professor. Surely, you can find a way to mend broken bridges.”
Broken bridges? Broken bridges? There had never been a "bridge" to begin with! Not with Potter, the carbon copy of his school bully, who spoke, acted, believed himself so superior to anyone else he might as well be the second coming of his father. There had always only been damp planks slogging down a river which separated them on two opposite banks. No bridge to speak of.
OR
Summer of Fifth Year. Dumbledore decides Harry should begin Occlumency immediately. Harry and Snape start seeing a lot of each other. Neither is thrilled, especially when they begrudgingly realise that maybe, possibly, perhaps, they might have more in common than they thought.