Elsa woke up with the worst hangover she had ever experienced. Not that she had experienced many in the past, as this was only the second one. Still, she swore she would never drink again. Her mouth was dry as dust and her head was pounding. She put a pillow on her face to hide herself from the sun and tried to remember what had happened the day before.

They had gone to a bar. And she could also remember going to a club. With Anna and her friends. But everything else was blurry. She could feel a soft sheet on her legs and a warm body pressed against her. She quickly ripped the pillow away from her face and opened her eyes to check. The sunlight burned her eyes again and sent a sharp pain to her brain, but she was glad to see that the lovely body against her was Anna's. Well, she felt a little alarmed, especially when she noticed that they were both in their underwear, but at least she hadn't spent the night with a stranger.

Her eyes slowly adjusted to the light and she realized that she didn't know where she was. The walls were painted green, the wooden furniture looked ancient and everything seemed to be old. She noticed the two dresses that they had been wearing the night before on the ground near the bed. It was hot in the room and they had kicked the sheets down during the night. It was only reaching up to their waists and Elsa shamefully glanced at her sister's slim and very desirable body. Her pink bra was nicely cupping her small breasts and her chest was rising and falling as she breathed peacefully. Her small waist and flat stomach were so enticing and Elsa lifted the sheet a little to see underneath.

She looked for a second at her sister's beautiful slim legs and thighs and quickly put the sheet back down as her eyes reached Anna's cute panties. God Elsa what the fuck are you doing! Her sister shifted because of the sudden movement and turned onto her stomach. Anna moved closer and nuzzled against her shoulder. Now, Elsa had a perfect view of her back and the dimples there that made her crazy every time she saw them. She could also see her sister's pink lips right in front of her. And if there was one thing she had definitely not forgotten about from the previous day, it was the kiss they had shared in the school yard. The torture only increased when Anna's right hand went up directly to her left breast. The redhead sighed happily. I need to wake her up.

Elsa shifted Anna's hand down to her stomach before nudging her a little. "Anna, wake up." She still didn't know where they were.

The redhead groaned and tried to put her hand back to where it had been a few seconds ago, but Elsa quickly stopped it. Damn, I don't remember her doing that during sleepovers. "Anna, wake up!"

The redhead finally opened her eyes and stretched against the blonde, which made her feel all fuzzy again. "Morning sis. Slept well?"

"I guess so. What happened? Where are we?"

"Wow you really overdid it, huh? Good thing I was there to watch over you." Anna smiled brightly and lifted her head to kiss Elsa on the cheek.

"Yeah, thanks. But tell me what happened now."

"You owe me three kisses first."

"Huh?"

"Good-morning kiss, thank-you kiss, and the kiss you promised me yesterday evening." The blonde put a finger under her sister's chin to tilt her face up. She kissed her on both cheeks and on the forehead. There was no need to complain as she knew Anna wouldn't tell her anything before she got what she want.

"Wow, I could totally have asked for more, right? You really don't remember anything."

"Did you just trick me into this so-called promised kiss?"

"I might have." She looked at her sister with a beaming smile and Elsa couldn't stop a smile from showing on her face too.

"So" began Anna as she rested her head back onto Elsa's shoulder and put an arm around her waist, "we went out yesterday to celebrate your diploma and the distinction you got." Elsa tried not to focus on her sister's bra against her naked side.

"Then, we got back home, to park your car and change into something more suitable." She kind of remembered everything up to this point. "And then, we went to a bar. Flynn made us play a drinking game, but you forced me to drink orange juice instead of alcohol." She pouted as she said that and Elsa wondered how her sister could possibly be so cute.

"Anyway you all got tipsy quickly and decided to eat something before going out to a club." That's when things became blurry. "You met some of your other classmates there, including some guys from your school. It was a big party and I guess you drank too much. It was to celebrate your graduation though, so I didn't stop you."

Elsa sighed. "I hope I didn't embarrass myself too much."

"Nope. We stayed and danced together. A few guys and a girl tried to flirt with you, but I made it clear you weren't available."

What had she done? She remembered the last time Anna had wanted to help it had involved some groping and kisses.

"Don't worry! I didn't touch you or anything. I told them you weren't looking for anyone, so that they would give up and try their luck with someone else."

She felt relieved. Not that she didn't like Anna's affection and touches, it was quite the contrary on that point. However, she'd like to remember them at least. And some of the people at the club might have known that they were sisters.

"What happened next? I still don't know in whose bed we're in."

"Well we stayed late, but finally called it a night. Rapz and Olaf were pretty hammered too, so Flynn decided we could all sleep at his place. We're in his parent's guest room. Rapunzel must be in Flynn's room and I guess Olaf is crashing somewhere on a couch or in a bathtub."

"Oh, good. Thanks for looking over me." She didn't want to imagine what could have happened otherwise. She was done with alcohol, it wasn't like her and she didn't like losing control.

"Sure, sis. No problem." Anna said as she kissed Elsa again without moving her head, so her lips brushed the crook of her sister's neck. It sent a shiver throughout Elsa's body and she quickly lifted the sheets to try justifying it.

"It's... uh... it's a little cold, don't you think?"

"Nope, it's pretty hot in there. Maybe you're a little sick because of the hangover. You aren't going to throw up on me, right?"

The blonde laughed and ruffled Anna's red hair with her free hand. "Nah, I don't think so."

Anna glanced at the clock on the wall. "Come on, we should get up, it's already past noon."

She got out of the bed and Elsa couldn't keep her eyes off her as Anna walked toward the dress on the floor and bent to pick it up. Oh God. Anna grabbed the small dress and slowly got into it. "Get up and help me with the zipper." She instructed.

Elsa did as she was told, but she blushed as she found herself in her underwear next to Anna. Especially because Anna wasn't shy about staring at her body. Well, she doesn't have unnatural thoughts about it, so she can look without feeling uncomfortable. And without it being lingerie, she was wearing her best-looking underwear, which didn't help the situation.

"Working out really pays off, huh? Maybe I should do it too."

"What? You don't need to, Anna. You're already so slim."

"Yeah... don't you think I should put on some muscle or something?"

It was getting dangerous, but Elsa really hated the insecurities Anna had about herself. If only she could realize how stunning she is. "You're perfect as you are, really."

"Thanks, sis." Anna kissed her again and then turned her back to her. Elsa pulled the zipper up and changed into her own dress. Without being asked, Anna got behind her and helped her with the zipper too.

"I guess we must look really stupid with these dresses on in the morning and with our hair completely messed up."

"I don't think Flynn can lend us any clothes."

They opened the door and searched for other people in the house. Elsa had never been here before, so she didn't know where to go. She really wanted to drink something. They came upon Olaf in what was most likely the living room and they heard people talking nearby. They avoided Elsa's sleeping friend and went over to the voices. Elsa quickly recognized Rapunzel's voice and opened the door.

Flynn and his girlfriend were sitting at a table, eating, and his parents were there too. She had met them once or twice and recognized them easily.

"Good morning, everyone." said Elsa, and Anna repeated it in a shy voice.

"Oh, it's nice to see you again Elsa! How are you?"

"Good, thank you. And thanks for letting us sleep here."

"No problem. We had a spare room, so we could spare it for you and your girlfriend."

"Uh..." Rapunzel laughed and Flynn scratched his head in confusion. Anna was red and looked really embarrassed. "No, no, this is Anna. She's my little sister." Was it really so obvious that Elsa loved her? Or was it because of Anna's clinginess?

"Oh!" It was Flynn's mother's turn to be embarrassed now. "I'm sorry. Flynn told us about... well, I just assumed..."

"It's ok. No harm done." Elsa smiled as she said so, but Anna added "It happens a lot" with a wide smile.

Rapunzel outdid it. "Yeah, they're really close. Elsa only softens up with her." Elsa shot her her coldest glare and was once again disappointed to see that her usually threatening glares didn't work on her friend.

Flynn's father addressed the two sisters. "Do you want to eat something? Sit with us."

They did and Elsa was glad to be able to drink some water. Olaf came along a few minutes later and joined them at the table. After lunch, Flynn asked the two girls if they wanted to take a shower and Rapunzel told them she could lend them some clothes that she had stored in Flynn's room, but they politely refused and went back home after thanking their hosts for the bed and meal.

Elsa still felt hungover and the trip in the subway didn't help. People were shouting all around her, the artificial lights were hurting her eyes and she only took comfort in her sister's touch as she held Anna's hand. She stared at their reflection in the window: they were both in a bad state and with the disheveled state of their hair and dresses, they really looked like party girls after a rough night. She wondered if people would believe they were a couple, holding hands like this in the subway, and with Anna's head on her shoulder. Yeah, they might think that. She knew the thought should have alarmed her, but she didn't have enough strength left in her to fight this. Let them think what they want.

When they finally got home, Elsa let her sister explain everything to her parents as she went upstairs. Apparently, Anna had at least warned their parents that they were sleeping at Flynn's. She closed the shutters, undressed completely and put on a comfortable nightdress before crashing onto her bed. She wanted to shower too, but the need for sleep was much more pressing. Anna arrived a few minutes later with an aspirin and two glasses of water. Elsa thanked her sister and drank both. Then, she lay on the side and soon felt Anna spooning her from behind. She didn't complain and let herself sink in Anna's embrace.

She fell asleep with a happy feeling when Anna's soft voice came to her ears. "Go back to sleep, sis. I'm not leaving you. I never will."

Anna spent the rest of the afternoon cuddling and spooning her sleeping sister. She thought about the previous day and came to the conclusion that it had been a really good one. She was happy for her sister's success and they had spent a great evening. And then, there had been the kiss. She still didn't understand what had gone through her head at the moment. Maybe it was seeing all those teenagers kissing each other. Maybe it was the way Elsa had spun her around. But she was glad Elsa hadn't taken it badly. The worst part was that she herself had rather enjoyed it. You're going crazy Anna!

When she got bored, she spent some time on her phone checking out some apartments in Corona. She still couldn't believe that their parents had agreed to it. We will be able to cuddle like this whenever we want.

Her mother called them down for dinner a few hours later and Anna woke Elsa up with a nudge.

"Wake up, sleepy head. Or you won't be able to sleep tonight."

They went downstairs and sat at the table.

"So, it seems you celebrated quite a lot."

The blonde grunted. "Yeah... you don't need to lecture me, I'm never drinking alcohol again."

Their father chuckled. "Good."

"Still, we're very proud of you, Elsa. You got exemplary results."

"Thanks, mom."

They talked about her diploma for a few minutes, before talking about the holidays. Anna winced because she still had a week of classes.

"When are you supposed to start working? Because we're going to leave on holidays from the 9th of July to the 23rd."

"I start on the 18th. It seems I won't be able to go with you this year." Anna didn't like that. There was no way she was going on holidays for two weeks without her sister.

"Can't you begin later? Do you really need this job?" asked Anna.

"Yeah of course I need it. And no, I can't start later."

"Ok then I won't go either!" she affirmed.

"Don't be silly Anna." her father said. "You can spend two weeks without your sister, you'll be seeing each other every day in September."

"But I'm going to be so bored if I'm stuck with you two!"

"Anna!"

"And it could be like a test to see how we manage on our own. You're afraid I'm not responsible enough, so I'll prove to you that I am."

"You're coming with us and that's it. No complaints."

The younger sister lowered her head in defeat. Stupid useless summer.

She waited for Elsa to go upstairs once dinner was over and brought the subject back up.

"Mom, dad, please, I don't want to go."

"Anna... the matter is closed."

She thought for a few minutes, to find a way to convince them and she finally remembered something. How could they have forgotten this? How could I have forgotten? What a sister I am.

"You really plan to leave her alone on the 16th?"

Her father facepalmed. "Shit. I completely forgot about that." Elsa was always depressed and in a bad shape on the 16th because of what had happened twelve years ago, and she usually began feeling bad a few days before.

"She needs me that week. You can't keep me away from her."

Her parents sighed. "Ok, ok. You'll stay here. But if anything goes wrong, you can forget about the flat in September, ok? It will be a test, as you said."

Anna didn't like it, but she nodded. It was too late and she genuinely couldn't leave Elsa alone on that day. It was the only time of the year when Elsa truly needed her.