Change the last part (marked by the ***) a bit and added a little more.
Lily and Vivian walked down the corridors when shrieks erupted from up ahead. A couple students ran out of the potions room as some bats made out of paper chased them down the hall. The girls glanced at each other, sighing as they went in to take their seats. It had become a common occurrence the past few months. The poor professors had realized detention wasn't much of a deterrence and had yet to figure out how to handle the unruly boys who had joined their classes this year.
"Good one Potter!" Sirius laughed so hard he nearly fell out of his chair while Lupin shook his head grinning before opening up his potions book.
Lily scowled at the four boys, "Are you missing detention already?" Peter opened his mouth to say something snarky when Professor Slughorn called the class to start. The class went smoothly as she and Lily fell into a rhythm. Vivian would prep the ingredients and Lily carefully added them when the timing was right. Before long class was called to end and the students left quickly to get lunch at the great hall. The girls smiled as Severus came into view. He hung back against the wall letting other students shuffle by. Meanwhile, James and his friend took up most of the walk way forcing other students to duck around them. Just then James reached out and knocked the books out of Severus's hands. Lily's face turned red as she hurried to pick up the scattered books yelling out, "James! You..you..you! Jerk!" Vivian stood still a wave of dejavu holding her captive for a moment. For a moment she could have sworn she was dreaming. Then it was gone. She frowned before joining Lily and Severus who had just finished picking up his books.
"Jerk is the best you could come up with?" She teased Lily whose anger often left her tongue tied.
"I always think of the good ones after they've left." She pouted.
"I could think of a few," Severus grumbled, still glaring ahead where the boys had left.
Vivian grinned, "We should make a list!" her stomach grumbled, "After lunch of course. I'm so hungry I'm getting a headache."
"I can make something for you if food doesn't help," Severus offered. He had been pretty cold the first week or two, but had slowly warmed up to her at least a little bit.
"I think food will do the trick, but I'll let you know. How could I turn down something made by the famous potion master himself?" She teased before waving goodbye as he joined the Slytherin table.
The headache remained a gentle throbbing behind her eyes throughout the remainder of her classes. Lily mentioned going to the hospital wing, but Vivian adamantly refused, promising to bed early instead. Laying her head on the cool desk she pretended to take notes wishing history would be over all ready. A small white object fell on her desk. Picking it up she realized it was a piece of paper balled up tight. She didn't have it in her to look around, more than likely it was another prank. The day had been oddly too quiet with the boys. Withholding a groan she slowly opened the paper. Instead of smoke or bright lights only a note appeared written in a messy scrawl. "Are you alright?" Before she had the chance to glance around another much larger white ball landed on her desk. The paper had been haphazardly wrapped around something dark. Slowly sitting up she glanced at the teacher who was still droning on before unwrapping the paper. Inside lay a single piece of chocolate with another note that read "Candy might help". Popping the sweet candy in her mouth she slowly looked around. No one stood out or even looked her way. Finally the class was dismissed. Vivian groaned, leaning back in her seat.
"I think I'm going to skip dinner."
"I can take you to the-" Vivian cut Lily off.
"I'll be fine. I promist. I just want to sleep. If I still have a headache in the morning I'll go."
Lily huffed her eyebrows pinched together in annoyance, "That's what you said at lunch and yet here you are." Vivian was about to respond when they heard Severus's voice from the hallway.
"What I'm doing is none of your business." He stood tall glaring at James and Sirius. In his hands he clutched a small bottle close to his chest.
"It definitely is our business if you're running around with a bottle of who-knows-what." James sneered, reaching out to grab it. "Who knows what a Slythrin like you is planning." Vivian stepped between them coming nose to nose with James.
"We could say the same about the lot of you. You're not Slytherin so what's your excuse?" Her head pounded with the rush of anger.
James' ears turned red.
"Our pranks never hurt anyone!" He hissed. "That's a fat load of rubbish! Pain doesn't just come from physical harm. Words can leave scars that last a lifetime. A harmless prank is one where everyone laughs." Turning on her heel she faced Severus putting out her hand. "That's for me isn't it?" He nodded before gently placing it in her hand. Looking both boys in the eye she opened the bottle and downed the whole thing. She held a straight face trying to ignore the strong bitter flavor that coated her tongue. "Is that proof enough?" The boys avoided eye contact and remained silent. "Good. We are off to dinner." With that she put her arms through her friends' arms and marched down the hall. Once they were far enough away Lily let out a low whistle. "Bloody hell Viv. I'm glad you're on our side. I didn't know you had it in you to go toe to toe with someone." Vivian slowed her pace as the anger dissipated and the throbbing became less intense.
"I knew I had it in me, I just never knew I could let it out," she smiled sheepishly. Trying to ignore the embarrassment that was starting to set in. "I'm going to bed before I die of embarrassment," she groaned, "is it too late to change houses?"
"I'm sure your parents could pull some stringsā¦from what I heard anyways." Severus piped up. "Is the potion helping? I picked a genetic one since we don't know the cause."
Vivian ignored his comment about her parents, "It's helped some. I'm sure rest will help with the rest. Thank you for making it Sev."
Vivian laid down trying to ignore the pounding in her head. She thought she heard Severus's voice. Sitting up she looked around. Quiet stillness greated her. Laying back down she drifted off.
She heard laughter and turned to find Severus dangling in the air. The boys laughing at him as they made him float higher. Vivian tried to call out, but her voice was stuck in her throat. From behind her Lily came running up to James scolding him and demanding Severus to be put down. Vivian gasped as Severus yells, "I don't need help from filthy little Mudbloods like her!" Looking closely Vivian realized all of them look taller and slightly older. Her dream shifts, blurring before her. A new scene unfolds. Severus is much older and teaching potions to a class of children. He is cold and bitter, critiquing mistakes harshly.
The morning light filtered in through a window. Vivian sat in the silence. The headache was gone leaving her with a certain clarity. She needed to change Severus's fate.
