This is in year 2 when the reader is taken down into the Chamber of Secrets.
You are Harry Potter's sister and Draco's crush, who he flirts with.

Draco was walking down the halls, bickering with Harry and Ron; they heard adult voices. They crept down the hall until they had reached the corner and what they'd heard, shocked them.
"It's finally happened. The monster has taken a student straight into the chamber itself!" Professor McGonagal said in worry.
The three boys listen to them until Madame Pomfrey asked a question.
"Who was it that got taken into the chamber?" She asked.
"Y/n Potter" McGonagal answered, sadly. Y/n was her favourite student in all of the years. Once the professors were gone, the boys crept from their hiding place and stared at the wall in horror.

" 'Her body will lie in the Chamber forever'. Y/n....." Draco sadly said, not showing too much emotion.
"You love her, don't you Malfoy?" Harry suddenly accused him, while Draco stuttered.
"I'd think that that would be obvious now Potter." Draco spat out his name like poison. Harry's calm posture turned mad in a instent and he pushed Draco against the wall, wand at his neck.
"I'll just accept it for Y/n but if you hurt her, you will feel the Golden Trio's wrath!" Harry said, protectively, but then Ron broke the posture.
"Shouldn't we be saving your sister mate?" Ron asked.
They both nodded and followed Harry to Lockhart's room and had a little row before dragging him to Moaning Murtle's bathroom.
"Harry say something in parceltongue." Ron said.
"Open" He said, in a whisper.
"Potter that was English" Draco hissed,  keeping an eye on Lockhart. Harry rolled his green eyes.
"Open" He hissed, in parceltongue and the sink opened revealing a straight drop tunnel. Draco pushed Lockhart down then jumped in, his heart beating quicker at the shere drop. Harry and Ron jumped in, screaming. Draco obliviated Lockhart. Once at the end of the tunnel, Draco, Harry and Ron found a huge snake skin. They ran past it and they was a open stone rock. Draco and Harry ran past it but as Ron was trying to get in,  the rock rolled over, leaving no sound to be heard.
"Come on Potter" Draco said as they both ran into the chamber.
Y/n was laying on the floor, looking dead. The boys glanced at each other before running towards Y/n. Suddenly, a teenage boy walked behind them and picked up Harrys wand.
"Y/n please don't be dead wake up!" Draco said, shaking her gently but she didn't wake. Harry saw Tom and began arguing with him until he released the basilisk onto Harry as he ran.
"Wake her up!" Draco shouted, finally, picking Y/n up in his arms. Riddle only laughed.
"Malfoy! It's like sleeping beauty! Kiss her on the lips! Or we all die in here!" Harry shouted and he ran out of a pipe and climes onto Salazar's head and slaying the basilisk. Draco kissed her on the lips but she didn't wake.
"Potter it isn't working!"
"Do it in three, two, one now!"
Draco kissed her on the lips passonately and Y/n started opening her eyes, kissing back. Draco's eyes widened and pulled Y/n onto him, continuing the snog. Harry had survived another year and was smiling.
"Malfoy we did it?" Harry saw his sister being snogged by his archenemy but chuckled and walked out towards Ron.