Thanks for all the reviews, it means a lot! I'm not great with continuity or actually keeping things up, so sorry for not updating loads! :)

Katherine awoke to find Elena snuggled in her arms clad in just her underwear, sleeping deeply. She smiled. She couldn't seem to stop smiling lately. Her past self would have been amazed and rather disgusted at her loving nature, but it was as if Elena was the trigger for her own humanity, something which she had missed more than she cared to admit. She stroked her hair, singing softly, basking in the afterglow of the previous night. She had never experienced anything like it; she knew she was in love. She reached for Elena's phone in the pocket of her discarded jeans, and grimaced at the amount of messages left from the Salvatore brothers, trying to ignore the pain that flashed through her every time she realised that Elena wasn't officially hers. It was morning, she would have to wake Elena soon, but at the moment she was content to watch her sleep.

Her heightened senses all of a sudden heard movement in the grounds above the tomb. In a flash she lay Elena down gently and retrieved her duffle bag from the entrance where she had dropped it the night before. Not a second later Stefan and Damon appeared, identical scowls on their faces. Katherine crouched by Elena, gently shaking her awake and putting her finger to her lips. She blinked up at her sleepily, confusion written all over her face.
"Katherine!" They heard Damon bark angrily. Elena's eyes widened, and Katherine motioned her to stay quiet as she walked out of the darkness into the light, her confident swagger returning. She had to admit, it was hilarious to see their faces as they realised she was only in her underwear.
"Something the matter boys?" She drawled, determined not to let on how terrified she was at being stuck in the tomb, or if they would detect Elena in the chamber. She leant back against the wall, stretching.
"What are you doing?" Damon demanded, his eyes roaming her. Katherine felt anger towards him. How dare he look at her?
"Is that any way to treat a lady? Sleeping, of course," she replied, smirking. Stefan raised his eyebrows in that irritating way he does.
"Where is Elena?" He asked. "She's not at home." His muscles were tense, showing his anxiety. Katherine weighed up her options. She couldn't let them know Elena was here, Stefan being Stefan would be the hero and enter the tomb to 'protect' her, meaning no more of their secret meetings.
"Lost your precious Elena already?" She tutted sarcastically. Damon clenched his fists.
"Relax, I haven't seen her. Why would I?" She lied, hoping desperately that Elena wouldn't make a sound. It wasn't as if they would hurt her, she was sure of that, but it would screw up any chance of Katherine ever getting out.
Stefan stared into her eyes, before stepping back and nudging his brother. "She's telling the truth, let's get out of here. We need to find her."
Katherine almost laughed at how easy it was to fool them, even after all this time. They gave her warning glances as they left, meaning to intimidate her, and she waited only long enough to hear their footsteps disappear before she was back at her double's side.

"What did they want?" Elena asked gruffly, still not having woken up fully. Katherine blinked, before remembering Elena was human and didn't possess the listening skills of a vampire like herself. She swiftly explained, noticing the light in her eyes fade as she realised the extent of her deceit.
"Katherine..." Her lip trembled and a tear rolled down her cheek. Katherine held her close to her chest, stroking her hair. "What am I going to do?" She heard her whisper. Katherine could feel the insecurities inside her rising to the surface. Elena would leave her in the end, she knew it. A life being with a vampire wouldn't be easy, but to be with a vampire identical to yourself? It would be impossible for them to live a normal life without people noticing.
"You don't have to do this Elena." With some effort Katherine hid her emotions, wanting to give Elena every opportunity to make her own decision. "I won't blame you for wanting to go back to them."
Elena's jaw dropped, and she punched Katherine's shoulder in frustration. Katherine flinched, it didn't hurt of course but it surprised her. "I love you! What can I do to make you see that? I love you!" Elena hissed. "I don't want to be with Stefan, or Damon. I just want you." Her eyes were wide, and Katherine saw nothing but honesty reflected back at her.
"I'm sorry; it's just hard for me to believe that you want me after everything I've done to hurt people in my life." She bit her lip.
Elena visibly softened and reached out to stroke her face. "That's in the past, Katherine. I'm not worried about how you were then. I'm interested in how you are now, and I love you."

"You know Stefan, we're going to need a new carpet with all that pacing you're doing. Can you just sit down? It's incredibly annoying." Damon drawled, stretching out on the sofa and drinking lazily from a blood bag.
"Why would she ask that Damon? Why would Elena, knowing full well what that bitch did to us, ask for Katherine to be released?" Stefan set his jaw and continued his pacing. Elena had rung him earlier from Bonnie's house and had been distant and cold. "It's not like her Damon. I know she had been to the tomb, I could smell it, but why would she lie? Katherine has obviously compelled her, but how? She has the necklace. Damon we need to finish her."
"As much as I love my name, it's getting a tad repetitive when you keep going on and on, so would you PLEASE shut up?" Damon set down the now empty blood bag and got to his feet. "Oh, and for your information little brother, it was your smart idea to put her in the tomb in the first place, where we can't get in, so how do you propose we 'finish her'?" He mocked.
Stefan pinned his brother against the wall, growling. Damon flipped him and gripped his throat. His eyes narrowed. "Don't ever, ever do that again. Just remember, I'm stronger than you little brother." He dropped Stefan to the floor, and exited out the window.

Elena dropped her keys on the table before opening the fridge and grabbing a bottle of water. As she shut the door Damon appeared behind it, scowling.
"Damon! Why do you all do that?" She gasped. He remained silent, glaring at her. She had a suspicion his mood was to do with her plea to release Katherine. Sighing, she put the water bottle back and began to trek upstairs. "Fine, Damon. Don't talk. It's not like I'm a mind reader or anything."
He appeared suddenly in front of her. "What was that stunt you pulled earlier? I'm not stupid Elena; I know you weren't at Bonnie's when we were looking for you." His eyebrows were drawn together, his eyes boring into hers.
"Damon, what are you talking about? How dare you even acc-"
He gripped her arm firmly, and pushed the hair away from her neck and stopped short when he saw the necklace resting on her chest. Elena pushed him off of her. "Damon! What are you doing? You're hurting me."
"The necklace. You've been wearing it all day?" He asked, his voice even. Elena nodded. "You went to see Katherine." It wasn't a question.
Elena sighed. "Yes. I wanted to...meet her. Also, I felt sorry for her." She ducked her head, waiting for Damon's reaction.
"You felt sorry for her? Elena, after everything she's done to us? To me? To Stefan?" His voice was incredulous.
"Yes! And you know why? I don't believe in blaming people for past mistakes. You didn't even give her a chance! You just assumed that she was here to hurt people! Now if you don't mind, I'm tired and I'd like you to leave." She knew she couldn't keep this up for long without Damon getting suspicious. She turned on her heel and ran up the stairs, retreating into the privacy of her room.
"This isn't over Elena!" She heard faintly, hearing the door slam.
She collapsed on her bed, exhausted. She couldn't keep up this double life with Katherine and the Salvatores. Something had to give, and soon.