The two sisters began to pant a little as they started to process their current situation; both of them were in Elsa's bed, complete naked under the sheets, with Anna's clothes on another side of the room while Elsa presumably made her's dissolve with her powers and both of them felt like someone stabbed them in the head thanks the effects of the hangovers they were experiencing.
As for what they might have done, only one thing came to their minds and it was something Elsa refused to admit, both verbally and mentally.
Anna turned to Elsa, fearfully. "Elsa…? Did we…?"
"No." Elsa stated quickly and firmly. "No, no, no, no, no, no, no… that's not possible. We-we couldn't have… have had… sex."
"Elsa! Look at us! We're in bed together, naked!" Anna pointed out.
"Yes, but… but… but do you… remember? Like anything about what happened…? Last-Last night I mean…?" Elsa questioned almost pleadingly.
"No I… oh… my head… everything's such a blur…" Anna expressed while rubbing in between her eyes.
Elsa rubbed her head as well. "Neither can I…" she admitted. "Oh… we drank so much of that wine… we must have been so drunk…"
"Drunk enough to…?" Anna started to say.
"No. No, it couldn't have happened… it-it couldn't have…" Elsa denied while shaking her head. "I-I do remember… I remember… laughing. Yes… I was laughing. A lot…"
"Hey… yeah! So… so was I!" Anna realized.
"Yes and that… that's all that happened." Elsa stated. "We drank, we laughed, we got… undressed… and we slept in the same bed together just like when we were little."
"And we didn't have sex?" Anna questioned, still unsure about the whole thing.
"No sex." Elsa shook her head, smiling.
Anna sighed in relief. "That's good…" she said. "Because… Because that would be wrong, right?"
"Completely."
"I mean… we're sisters. Related by blood and stuff…"
"Not to mention, I'm the Queen and you have Kristoff."
"Exactly! So why would we…?"
"We wouldn't!"
The two sisters start to laugh at the thought of making love to each other. Part of them was still a little unsure if they really didn't or not, but both of them kept those thoughts to themselves so as to not worry the other. Eventually they both stop laughing and sighed deeply.
"Well I'd… better get dressed and back to my room before anyone comes in and sees us or thinks I'm missing." Anna suggested as she started to turn herself around.
"Yes… we don't want that to happen…" Elsa nodded while Anna's feet touched the ground on the side of the bed. She only gave Anna a quick glance as she stood up from the bed but upon catching a look at something on her sister's body, her eyes bugged out.
There, right on her sister's right buttock, was a bright red mark that seemed to resemble a hickey of some kind, which it was, much to her horror.
Anna stretched her arms a little as she stood where she was and was just about to go get her clothes when she noticed her older sister staring at her.
"Elsa? What's wrong? Why are you…?" she began to ask before her face turned bright red and she turned around to cover herself up. As she glared at Elsa, she used one arm to cover her breasts and her other hand to cover her crotch. "Elsa! Are you… Are you checking me out!?"
"What? Oh, no! No! That's not it at all!" Elsa protested, feeling just as embarrassed as her sister.
"Then why are you…!?" Anna started to demand.
"Look! On your right cheek!" Elsa told her while pointing at her. A confused Anna quickly rubbed her right face cheek. "Not that cheek…"
"Not that… what are you…?" Anna began to question before she turned and looked at the full length mirror behind her and saw the hickey on her bum.
The red haired Princess yelped when she saw it and quickly hurried over to the mirror. She turned around and bent over a little to get a closer look at it. She gasped sharply, which confirmed what she and Elsa deeply feared.
"Oh no… Elsa…" Anna started to say as she turned to her sister, wide eyed. "I think we really did have sex…"
The Queen started to hyperventilate a little as she held her head and groaned a little as another, but smaller, wave of pain goes through her head. "Oh heavens… I-I-I remember now… I-I… I kissed something… bit something…"
"You bit my butt!?" Anna exclaimed in shock.
"I-I-I'm sorry! I'm sorry! I'm so sorry! I was drunk! We both were…!" A regretful Elsa expressed strongly. "In fact… I wouldn't be surprised if you did the same thing to me!"
"What!? I-I wouldn't…!" Anna tried to defend herself while blushing.
"Oh really?" Elsa asked, doubtfully. She pushed the covers back and crawled across the bed on all fours before turning her bottom toward her sister, making her turn away with a red face.
"Elsa! What are you doing!?" Anna questioned in a hushed but stressed tone. "Put-Put that away… would you…? Please? I really don't wanna look at my own sisters butt… Uh, no offence by the way…! But…"
"Just look." The Queen practically ordered. "Do I or do I not have a hickey on my buttocks?"
Anna's arms were raised at the moment while her eyes were also closed tightly. She eventually opened one of them and, just a few seconds later, the other opened as well as her jaw dropped upon gasping sharply.
It was as her sister suspected and feared, Elsa also possessed a hickey, right on her left butt cheek, no doubt planted by Anna herself.
"Oh no…" That is all the red haired Princess could say.
Elsa's eyes widened. "So it's true?" she inquired, fearfully. A nod from her sister was all the confirmation that the Queen needed. With a heavy sigh, Elsa sat her marked tushie on the bed and placed a hand on her head. "Oh no… No… What have we done, Anna? What have we done…!?"
"Elsa…" Anna said as she approached her distraught sister.
"This isn't good Anna… This is not good…!" The Snow Queen muttered in a scared tone as she shook her head.
Anna climbed back onto the bed upon reaching it and approached her sister. "Elsa… Elsa it's ok…" she tried to tell her sister comfortingly.
"No!" Elsa exclaimed emotionally as she turned to Anna. "No, it's not ok! Don't you see? Don't you realize what we've done!? We've committed the taboo of incest! An unforgivable sin!"
"O-Ok maybe but… but it wasn't like this was uh… uh, done with a clear head, right?" Anna inquired, hopefully. "I-I mean… we-we drunk! Super drunk! It-It could have happened to anyone."
"But it happened to us, Anna." Elsa stated. "Us! The Royal Sisters of Arendelle! If-If the people… or anyone finds out!"
"They won't find out." Anna tried to assure her sister.
"You don't know that!" Elsa reminded Anna.
"No, I'm telling you, Elsa. They won't!" Anna stated, firmly. "This… This was just a one time thing! An accident! A secret we'll both take to our graves! And besides, it's not like anyone saw us or…"
A knock on the door startled both sisters, Anna quickly covered her mouth to keep herself from screaming.
"You're majesty, are you up?" A voice belonging to their servant, Kai, asked.
"Uh… yes! Yes, I'm-I'm up!" Elsa replied quickly while trying to hide the fear in her voice. "What is it?"
"I came to tell you that the Royal Cook has just prepared breakfast for you and Princess Anna." Kai announced.
"Oh! Uh… great! Thank you! I'll… I'll be there soon." Elsa told Kai.
"By the way, if you don't mind me asking your majesty, do you happen to know where Princess Anna is do you?" Kai inquired, making the aforementioned naked Princess freeze up.
Elsa also became nervous but hid it with a calm tone. "Uh… no, why? Isn't she… in-in her room?"
"I'm sorry your majesty, but she isn't and we've been searching all over the castle for her."
"Um… well… I'm sure she's around somewhere… a-after all it is a huge castle."
"Hmm, I suppose you are right, your majesty."
"I'll-I'll let you know when I find her…"
"Thank you, your majesty. I'll be taking my leave now."
"Alright, thank you very much!"
The sisters listened to Kai's footsteps as they got further and further away before sighing in relief.
"That was close…!" Anna expressed in relief.
"We're lucky the servants aren't allowed to enter our rooms without permission…" Elsa added.
"I'll say…" Anna nodded in agreement.
"However… how did he know you weren't in your…" Elsa began.
"I… may have left the door opened a little when I went to sneak into the…" Anna admitted.
Elsa sighed while putting her hand on head. "Oh Anna…"
"What? I'm sorry! I-I figured the trip would be quick! Just get in, get out with the wine, no muss, no fuss!" Anna said, defensively. "But hey, it's not a big deal! We still didn't caught!"
"But it caused everyone to worry and search all over for you! If… If they came in here…!" Elsa started to say, looking and sounding very worried.
"They didn't! They wouldn't have!" Anna insisted, though her sister still continued to look worried. "Elsa. Elsa!"
The younger sister grabbed her sister's arms to make her look her in the eye.
"It's fine. We're ok. Everything's gonna be fine, I promise." The redhead assured Elsa.
As she stared to her sister's eyes, Elsa felt that same warm feeling she felt when Anna hugged last night in the wine cellar, only this time it was stronger. She could feel a strong magnetic pull towards Anna even, toward her soft, rosy lips. Elsa struggled with fighting it, but it was as if all rationality in her mind was evaporating in an instant as well as any reminder that she and Anna were related by blood.
Soon enough, Elsa's mind went blank as something else suddenly took over her body. She stopped fighting the pull and her own lips move forward to press against Anna's, this caused her younger sister's eyes to widen.
Elsa's lips were cold, in contrast to Anna's warm lips, but were even sweeter as Anna quickly discovered. While she was surprised by the sweetness of her sister's lips, Anna's mind quickly reminded her of the fact that it was her sister kissing her. The shock of this caused her to release Elsa's arms and caused her hands to shake while muffled cries of protest emit from her.
She tried to pull away, but her sister quickly cupped her face with her chilly hands. While Elsa's touch didn't turn her to ice, it did freeze her in place and kept her from pulling away.
Anna soon felt something poking her lips before quickly realizing that it was her sisters tongue, trying to gain entry. Eventually it did and quickly started to swirl around her own tongue and the inside of her mouth.
Following sixty-seconds of swapping spit with her Queen, the Princess soon decided to try and do something to stop it, even though deep down she was enjoying it immensely. She slowly reached forward and grabbed the closest thing she could grab; her sister's tit.
She took the surprisingly stiff nipple between her two fingers and gave it a strong tug. This caused Elsa's eyes to widen and a muffled squeak to emit from her as she snapped out of her trance and realized what she was doing.
Upon the pleasure she felt from having her nipples pulled vanishing, Elsa quickly stopped cupping her sister's face and pulled away with horrified looking eyes, like she had just frozen her heart all over again.
Anna meanwhile, slowly reached toward her lips and felt them, the taste of her sister was still there and they still felt cold. The royal sisters stared at each other and panted as the realization of what just happened and the potential consequences of it started to fill their minds.
Soon enough though, Elsa finally managed to speak again. "This is very not allowed…"
"Well… well… well at least no one…" Anna began to say, still trying to stay positive and find some way to calm her panicked sister down, even though she was panicking herself.
But before she could say very much, someone else knocked on the other side of the door, startling them again.
"Hey, Anna! Elsa! You guys up yet?"
The sisters gasped, they knew that voice.
"Olaf…!" They whispered to each other, worriedly.
"Are you guys still sleeping?" Olaf questioned in a teasing manner. The two young women could practically see his little eye looking through the keyhole and hear him even talk through it. "Well, I'd better come in and wake you guys up myself! Hope you enjoy a good morning hug! I know I do!"
Anna and Elsa gasped sharply once again as the knob on the door started to shake and turn side to side.