"Detention for the next week with Filch," Snape drawled, "for interrupting a class with no satisfactory reason. Twenty points from Gryffindor, as well." His gaze ever so slightly shifted to look at Draco, who only smirked back. The brat. He really was a nuisance. Looking around the classroom, he noted that everyone had stopped working to watch. "Back to work, all of you!"

"Don't you think you've made Harry's day bad enough?" Blaise asked. "He looks absolutely miserable."

"Not my fault," Draco said dismissively, writing the last line on his summary. 

"It is, and you know it," Blaise replied, his tone serious. "Why don't you leave him alone for the rest of the day? Whatever happened between you two, I'm sure it wasn't so bad that you have to bully him along with Snape."

"Oh, it was bad alright," Draco sneered, turning to his friend. "Stop defending Potter."

"Tell me what happened," Blaise said, ignoring Draco's last remark. Draco raised an eyebrow.

"No."

"Draco," Blaise said warningly, "we're best friends aren't we? We tell each other everything."

"We aren't girls, Blaise, so no, we don't." 

"Fine," Blaise said quietly, "Legilimens." 

Draco had no time to put up his shields, so astonished was he that his own best friend would use Legilimency on him. He had never thought Blaise would turn his talent on him.

Blaise rifled through the images of the morning. He looked horrified when he wrenched himself away from Draco.

"Your parents are dead," he said flatly, "and you kissed Harry. And liked it."

Draco didn't reply, shaking with anger. "Don't you dare say another word to anyone," he hissed, and he stood up and fled the room, not caring that Snape was watching him intently. The Potions Master let the boy go, also being an accomplished Legilimens and also having seen what had happened that morning.

At the end of the lesson, Snape dismissed the class. "And I want 20 inches on the history of Veritaserum, due next class." He bared his teeth in a feral grin, enjoying the moans that followed this announcement. "Mr. Potter, please stay back. We must discuss the terms of your punishment."

"There is such a thing as the word 'no', Potter," Snape growled. "I will not have you treat my godson like that. He has already been through enough without you sticking your head in." He paused for a moment, his eyes glittering angrily. "But if it will convince you to leave him alone, I will tell you something. This stays in strict confidentiality, do you hear me?" 

Snape sneered at his lack of patience. Typical Gryffindor brat. He took out his wand, for the fun of it looking as if he was going to point it at Harry, before directing it to ward all doors and windows, and to Silence them so they would not be overhead.

"This is a very important matter, Potter," Snape said, "and it'll be on my head if word gets out. Therefore, we will take a Wizarding Oath to keep this secret. If you do not agree, you have until ten to get out of here." He realised he sounded remarkably like Draco had that morning.

((No, it's fine. I didn't explain it. xD))

"Then let it be  pledged," Snape murmured, and he felt a tingle of magic surround him. He relaxed now, slightly. Looking carefully into Harry's face, he said, "I am a spy."