Severus Snape was pacing the corridors remembering the good times with Lily. 
~FLASHBACK~
"So how did you do on the potions exam?" He asked she looked at him her eyebrows raised.

"Come on, Sev, you know I did good. I always do." She said confidently but it was true. She was exepotnally good at potions. 

"Yea you do. So what are you going to do after Hogwarts?" He had asked she smiled.

"An Auror, of course. I swear if I have to work with James Potter I'll die!" She exclaimed he was to tranfixed with her beauty to see her cross her fingers. "What'll you do?" She asked me I grinned at her.

"Dunno. I kinda want to be a Death Eater." He smiled she stopped and glared at him. "Just kidding!" He assured her. 'What she dosen't know won't hurt her.' He had thought. He had already joined them. Then Potter showed up
~END FLASHBACK~
He sighed then he heard noise in a broom closet. 'Time to bust the snoggers' he thought then he opened the door. He got the shock of his life. 'Lily & James?!' He thought he quickly tried to stop them. When the couple stop snogging and saw him he noticed it was Ginny Weasley and Harry Potter. Ginny's top was up a little above her belly button and Potter's hair was messed up even more than usual and his shirt was unbuttoned till the middle. 

"Potter, Weasley, why are you out this late?" He asked trying to be calm but after almost seeing a Lily-James it was very, very, VERY hard.

"Nothing, just having a-discussion-with Miss Weasley here." Potter said with as much arrogance as his father. He glared at him. Then he remembered that Potter the Elder had said that to him. Well sort of.
~FLASHBACK....AGAIN~
He was patroling the corridor's. Alone, silently, alone. He heard voices, giggling, and a few smacking of lips. I so stupidly went to investigate. When I got to the door of the Broom closet. I opened it to see Lily-my Lily!-snogging James Potter. When they noticed me Lily looked anything but apologetic.

"What are you doing here Snivellius?" She asked her voice as cold as ice. I looked up at her as Potter put his arms around her waist.

"What-what were you two doing Mudblood?" He asked then soon he had a wand pointed to his neck.

"Don't you ever, ever, call her that again. Got that Snivellus?" He asked his eyes daring him to say it again.

"Yes I 'got it'. But what were you doing?" I asked again Potter smirked and planted his hands on her hips again. She smiled up at him.

"Nothing, I was having a-discussion-with Miss Evans here." He said I looked at Lily who was staring lovingly up at Potter. I quickly turned on my heel and stalked off.
~END FLASHBACK AGAIN~
"Er...Professor Snape?" Ginny asked as she waved her hand infront of his face that had glazed over. Harry shrugged.

"Come on, Gin, lets leave before he gives me another detention and-Merlin forbid it-you one, too." Harry said stepping around him offering her his hand. She took it and they walked hand-in-hand till they reached Gryffindor Tower.