I am making up my own season 4 so Elena will be a vampire but I'm not going to follow any of the actual events. However I am pretending that episode 1 happened because I need Elena to have already gone through her transition.
Elena P.O.V
Dear diary
I never wanted to be a vampire, I thought that I would never have to become one I wanted to grow up and go to collage, have a family and everything else humans did. Now I'm stuck in this 18-year-old body the only positive is that I will never have to look old and I guess I can remain friends with Caroline forever… I wish that I could still be human however.
Elena's throat began to burn and her mouth was very dry. She walked downstairs and into the kitchen and poured herself a glass of water. She gulped it down quickly, the feeling didn't go away and drank another glass then another, and not quite feeling satisfied Elena became frustrated and threw the glass across the room. Her stomach suddenly growled loudly, as she realized that she needed blood to get rid of this feeling. She quickly pulled out her phone to call Caroline to complain, "Caroline, Elena cried into the phone I'm starving…" before Elena could finish her sentence she heard a knock on the door.
It was Caroline holding a large bad filled with blood bags. Elena smelt the blood reeking from the bag and the veins under her eyes sprouted out. Elena snatched the bag from her and using her new vampire speed ripped the bag and began hungrily drinking out of one of the blood bags, she had downed it in seconds and reached for another. Before she could have another, Caroline had kicked the bag away and stepped in front of her. "Elena stop" she shouted while holding Elena back. Elena hissed and tackled Caroline to the floor but Caroline being stronger and expecting her attack quickly had Elena pinned on the ground. "Get off of me" Elena barked. Caroline replied back loudly "Elena you need to learn some control so I invited Stephan over, he knows all about controlling blood urges." Elena's fangs and veins vanished and Caroline got off Elena and helped her up still holding onto Elena's arm and taking her upstairs away from the other blood bags.
Caroline P.O.V
When they got upstairs Caroline tried to distract Elena by talking about non – vampire related topics. When Caroline's phone went off, it was a text from Stephan I can't help Elena today but I'll be there tomorrow first thing, I can take her hunting just try and keep her occupied today. Caroline signed but then texted back, ok have any suggestions? After several moments of waiting for a reply, none came, Caroline then thought to herself he better have a good excuse for not coming. She looks back and Elena and explained that Stephan wont be of any help today but he would be here tomorrow.
She heard the door closing downstairs and a shout throughout the house "Elena" she heard being called out. Oh shoot, I forgot about Jeremy! Caroline looked around the room and noticed Elena just exiting, racing downstairs. Caroline chased after her and when she ran into the kitchen she saw Elena feeding from Jeremy and quickly pried her off. Jeremy fell to the ground his neck gushing blood. She quickly bit into her wrist and put it up to his mouth, forcing her blood down. Jeremy opened his eyes continuing to drink more a little bit more of Caroline's blood. When she pulled away, Jeremy thanked her and then they both turned to look over at Elena who was grabbing onto the wall so hard that her nails went through the wall. Caroline noticing Elena's struggling, turned back to Jeremy and told him to go spend the night at Matt's and that she would let him when it would be safe for him to return. Jeremy darted out of the house and began to drive away as Caroline instructed.
Caroline returned her attention back to Elena who was in tears, realizing what she had done. Caroline felt pity for Elena, remembering when she went through the same emotions that she imagined Elena was going through at this very moment. The guilt that she must be feeling Caroline thought, as she put a gentle hand on Elena's back leading her back towards Elena's bedroom. Caroline tried to comfort her reminding her that Jeremy was safe and that she would learn control her urges soon enough until she looked over at Elena who had cried herself to sleep.
Elena's P.O.V
Elena woke up early, looking around she saw Caroline in her bed sound asleep, trying not to wake her she crawled out of bed and stepped into the bathroom to take a shower. She commenced to think back to the events of last night remember the look on Jeremy's face when he looked at my vampire fangs and veins and started to think what if she killed him. She started to panic slamming the shower tap off and started to breath heavily and fell on the edge of the bathtub, Elena tried to regulate her breathing reminding herself that Jeremy was fine. She knew that all hope would be lost if she had lost the only family that she had left, without Jeremy she knew she would lose it. Stepping back into her bedroom she went towards her closet and selected out some old jeans and an old t-shirt and threw them on. Looking back at her bed, she noticed the awaked Caroline who was on her phone. About to ask her who she was texting, she heard a knock at the door and went downstairs. Elena opened the door to a tired looking Stephan and let him through the door.
"Hey Elena" Stephan greeted warmly, Elena replied with a quiet hello closing the door behind Stephan. The veins under Elena's eyes began to show, and she remembered that she hasn't feed in a while now and was beginning to get hungry. A concerned look from Stephan got a snappy remark out of Elena "What?" Stephan taking a step back from Elena realizing she wasn't in a good mood and he called down for Caroline. Caroline then appeared at the top of the stairs asking both of them if they were ready to go. Elena wondering what she was talking about then asked "where are we going?" "Hunting, but for now only for animals so you wont accidentally kill any humans." The three of them flashed out of the house using vamp speed so they wouldn't have any human interaction towards the direction of the woods.