To be honest, I didn't know exactly what to make of it.

I didn't dare make a sound for fear of alerting them of my presence. For a few moments, it sounded like the kiss was travelling, moving around the space. What is going on? I imagined one of them grasping the hair of the other, dotting their neck with feather light kisses. I imagined them coming together again, their lips forming a symphony of sound before they pulled away to catch their breath. I imagined the taboo nature of their actions fueled them on. Why am I even imagining this?

"Anna, the door."

"Oh, right."

I shrank back into the shadows, still as a statue, until an unseen hand from the other side of the timber wrapped around the cool metal handle, pulling their room door shut and turning the lock with a soft click. Still, I didn't move until I heard the retreating footsteps fade away. Feeling my way along the corridor in the hallway dimly illuminated by the moonlight, I silently entered my room, shutting the door behind me and trying desperately not to think about what could potentially be going on in the next room over.

Did I really just see that happen?

I was in denial.

No. I didn't see that happen. I saw neither of them, just shadows, which can be very deceiving. So many factors could have warped and twisted what I think I could have seen. The direction of the light, the position of the things blocking the light, my own delirium. After all, how late is it? Midnight? God, I'm tired. Yes, that must be it. I'm exhausted and my mind is playing tricks on me. Why am I even torturing myself like this? Who knows!

The water of my shower was cool as it hit my skin, slightly flushed from the supposed encounter. I didn't bother washing my hair though. It was far too late for that. Thankfully my room had an en suite bathroom. I didn't think I could dare go out there again. After I had towelled off, I slipped on a lovely silk nightgown - a gift from Agnarr many years ago. The material slid easily across my bare skin. It was a comforting feeling. Familiar.

A few moments were spent sitting in front of the vanity, methodically brushing out my long brunette hair, smoothing out the knots so that it flowed in locks down my back. It's funny to think that Elsa's blonde hair and Anna's strawberry blonde hair somehow came to be. Recessive genes, I suppose. Tired and frankly trying to avoid being awake to even think for any longer, I crawled beneath the covers, my head sinking into the soft pillow.

The realisation had hit me sooner that I'd have liked. If I could have just drifted off to sleep, everything would have been peachy and I could chalk off the whole experience to a mixture of fatigue and deliriousness. But no. I had to remember that the headboard of my bed was pressed against a wall. And right on the other side of said wall was the headboard of Anna's bed. Which was probably empty. Across from which was Elsa's bed. Which, judging from the shadows, they were sleeping in. Or not sleeping in. Together.

A small groan of frustration rumbled from my throat. Why are you even thinking about this, Iduna? For God's sake, you don't even know what you saw.

I strained my ears and could have sworn I heard something. What it was exactly, I couldn't be sure. That's a lie. I was absolutely sure and just trying to convince myself otherwise. The sound was rhythmic, mechanical, almost like the sound of a headboard hitting a wall over and over. No. Not almost. That's exactly what it was.

You are probably just seeing things, hearing things. They're just being sisters, comforting each other in a time of hurt and pain. And a small kiss on the cheek is nothing to look twice at between sisters.

Yes. Sisters.

Sighing heavily, I buried myself under the covers, willing sleep to take me.

XXX

"Morning Mom."

My eldest was always an early riser.

"Good morning. Is Anna awake yet?"

My youngest was quite the opposite.

"Soon, I'm sure. I gave her a good nudge before I got changed, and another after. But to be honest, it's anyone's guess when she wakes up from her coma-like sleep."

Elsa was already ready for the day, her platinum blonde hair done in her signature braid across her left shoulder. Neither of them really wore anything very tight fitting for fear of anyone spotting their… differences between their legs. She was dressed in a simple shirt and a long black skirt with buttons down the front, standing at the kitchen counter pouring herself a bowl of cereal.

"Coffee?" I asked, making myself a steamy mug of joe to try to force myself awake.

She shook her head. "Not today, thanks."

We turned in unison to see Anna stumble from out of their room and into the kitchen in an oversized sleeping shirt. Her hair was tangled and matted as it always was whenever she got up. Strangely, she had a scarf wrapped around her neck. Sure, it was cold, but it wasn't that cold. I pushed away any suspicions I had about why she would feel the need to wear it. Just sit down and enjoy breakfast.

"Morning sweetie," I greeted, to which she answered with some muttered, half asleep response. Anna always needed coffee first thing, and a mug sat on the counter ready for her which she eagerly yet tiredly drank up.

I sat across from them both, letting my drink warm my hands, still chilly from sleep. The night before, I hadn't heard anything else strange. Though, of course, I wasn't listening out for anything in particular. If I'm honest, I was trying to avoid hearing anything at all. Still, I couldn't bring myself to look either in the eye for too long, for fear that my face might somehow give me away. "Did you both sleep okay?"

They shared a knowing glance, Anna's cheeks blushing slightly. But Elsa held her composure. "Fine. Why do you ask?"

I threaded a hand through my hair. "Oh, just wondering. I got home pretty late, work and everything. Was stuck in the lab for way longer than expected. I wanted to come in and see you guys in case you were awake but the door was locked so I figured you were asleep."

Neither of them gave anything away.

I guess they would have practised keeping cool. No. What am I talking about? They wouldn't have practised because nothing happened period.

"Yeah. We had an early night last night," Elsa said calmly. "We didn't mean to lock the door, but it's a force of habit whenever we're changing, even if the house is empty."

"We're sorry if we worried you," Anna's care in her voice was genuine and it brought a small smile to my face, even if I had a hunch that they were covering up the truth.

"It's alright," I let out a small sigh. "I'm sorry I can't be home more often, girls. I know I'm here the first half of the day but you both have classes and then work keeps me out so late and I wish we didn't have to keep missing each other like this."

The two of them shared another knowing look before turning back to me with concern written on their faces. Anna spoke.

"It's okay, Mom. Really. We know you're busy, but it keeps a roof over our heads and food on the table-"

"And we still have lots of time together on weekends and during the holidays," Elsa interrupted. "Let's not waste time thinking about what could be, and just be content with what we have now. Just for a little bit."

A smile tugged at the edges of my lips and I just wanted to reach out and hug them both. "Well, let's spend some time together this morning. I'll give you two a lift to campus. Though, Anna, you'll need to get ready. It looks like you've just woken up from a coma, dear."

XXX

Those next few days, I… God, I don't even know what to think of those next few days

Maybe I was just in my own head, but I swear I was noticing so many more things. The knowing looks that they shared. The way that they seemed to finish each other's sentences. The way that they continued to lock their door, opting to message me when they "went to bed" so I wouldn't worry about them.

It seemed like every time I entered a room, something between them… shifted. One evening, I walked into the kitchen to see Elsa standing very closely behind Anna, her hands on her little sister's waist, her slender fingers delicately touching the bit of exposed midriff. They were whispering something to each other, but the second they saw me, they jumped apart, acting like nothing was out of the ordinary. Nothing whatsoever.

I would spend days thinking about it. The possibility that they could be doing… things. Of course, my girls are adults. I wouldn't have been surprised if they told me they were being intimate with another person. They'd both come out to me, telling me that they were attracted to girls rather than boys and I had accepted that. But could I really accept the idea that they were together? I supposed I would have to bring it up to them, but how would I even do that? Heck, I was sure they still believed I was none the wiser.

"Iduna?"

The sweet voice of my co-worker suddenly ripped me from my thoughts.

"Hi Honeymaren, what is it?"

"Yelana wants to see you."

I raised an eyebrow at her. "Did she say why?"

She just shrugged in response. "She didn't mention anything else. I'm sure it's nothing though. Maybe just checking in with how your research is coming along." Honeymaren offered me a kind smile before returning to the lab gardens where she could almost always be found, hands buried up to the wrists in dirt. Wiping my slightly sweaty palms off on my coat, I made my way through out of the lab and towards the attached office building. Am I in trouble? Why would Yelana ask to see me? Come on Iduna, think! What could you have possibly done to warrant a visit to the boss' office?

I rapped my knuckles twice on the thick oak door, waiting respectfully outside until I heard a low voice beckon me inside.

Yelana was an older woman who had been working for far longer than me. Her hair was entirely white, free flowing down her back and secured with a braided headband, only ever tied up if she was in the labs. Wrinkles had begun to settle into her face with age, but this just made her look nearly as wise as she is. I had always seen her as a huge role model, her passion for ecology and the environment a massive inspiration for me. While she was our boss, she was pretty laid back, even organising frequent company outings to nature trails in the nearby forest. Nonetheless, she was still my boss and did have the power to fire me at any moment.

"You asked to see me, Yelana?"

"Iduna, yes," the older woman smiled sweetly at me, putting aside her work for a moment. She gestured to the chair opposite her, which I hesitantly sank into. "You seem a little out of it recently. Are you alright?"

A small blush spread to my cheeks. Oh yeah, fine. It's just that I have a sneaking suspicion that my daughters are sleeping together whenever I'm at work, but yes, everything's just peachy. "I'm fine. Sorry, it's just… there's been a lot on my mind recently. I'm sorry if it's affected my work, and if I'm in any sort of trouble-"

Yelana gracefully held a hand up, silencing me. "You're not in any trouble, don't worry. I know that you've had a tough couple of months, but this hasn't hindered your work in the slightest. Your recent investigations have been commendable, really exceptional work."

"Really?" I gasped in disbelief.

"Indeed," she chuckled. "In fact, I called you here to tell you that you're being promoted and your work is getting more funding. I know it was meant to be a smaller project, but the discoveries you're unearthing could be revolutionary. Harnessing renewable energy from snowfall, where did you even come up with that?"

All I could do was stare back at her in shock as she continued.

"So yes, more funding, a rung higher up on the laboratory corporate ladder, and this is going to become a full scale research project, with a full team working by your side. This obviously means some changes to your salary but the most important and most immediate is the shift in working hours. You won't need to be working any more late nights. Seeing as you'll now be able to lead a small team, you'll be more of an overseer whilst the practicals are handled by them. So you only need to be in the first half to three quarters of the day."

"I… I don't know what to say."

"You don't need to say anything. Unless... you don't want to take the promotion?"

"Of course I want the promotion!" I babbled quickly. "I just… thank you. This is overwhelming. I mean, you know the last few months have been difficult, especially with the girls moving in permanently. I thought my work would have been badly affected but this was the affirmation I needed."

Yelana gave me a comforting nod. "It will officially start on Monday, but hey, since it's the end of the week, why don't you go ahead and clock off early? We'll sort the rest of the details out next week."

"Are… are you sure?" I asked, still unable to believe everything she was telling me.

"Go spend some time with your daughters tonight. You deserve a break." She reached out, offering her hand which I shook firmly, hoping my own palm wasn't sweaty with nerves.

"Thank you, Yelana."

XXX

God, I hope the girls are home. I didn't buy celebratory promotion sushi for nothing.

I was driving in my car, trays of sushi carefully belted into the passenger seat so as to not fall over. While a tiny proportion of my mind was still preoccupied with what I had been seeing in those weeks prior, I also didn't want to bring a downer on what was meant to be a happy celebration.

But how could I not bring it up? What kind of mother would I be if I just let that continue right under my nose even when I was very much aware of it. Alright, Iduna. You're going to bite the bullet. Tonight, we're going to have nice, wholesome family fun, and you will bring it up tomorrow. No more beating around the bush. Best case scenario, you've been letting your work stress you to the point that you're hallucinating. Worst case…

My grip was steely on the wheel as I turned onto our street, my knuckles white. I knew it was going to be fine, that I was likely overthinking just about everything, But as I parked the car in our garage, there was an ever lurking presence of nervousness and uncertainty.

"Elsa! Anna! I'm home!" No response.

The house seemed still. Quiet and empty. At least, the communal areas did. I assumed Elsa and Anna were in their room, probably doing homework or winding down at the end of a long week. I wanted to surprise them. It would be a nice change to be able to have dinner together for the first night in ages. Methodically placing the food in the fridge to keep it cold, I washed my hands and went to look for them.

There was a crack of light under their door, indicating that they must have been in there. Instinctively, I rapped on the door lightly before turning the handle, swinging it open. Unfortunately, my hands worked fast, too fast for my ears to catch on to what was happening. Too fast for me to hear the heavy breathing and panting, the low moans of pleasure, the slapping of skin against skin.

"Girls…?"

By the time I came to my senses, it was too late, and I saw… everything.

Elsa was on top of Anna, who was on her hands and knees, the both of them naked and drenched in sweat, her cock buried deep in her sister's ass. Although I couldn't see it quite well, it looked to be quite thick, an impressive girth. Anna's dick was long and hard, sticking up against her stomach as her sister rutted into her. I let out an inaudible wince when Elsa's hand came down hard on Anna's ass, the slap reverberating around the room. A red hand print formed, joining the dozens that already marked her. The sheets underneath them were a tangled mess, giving me the impression that they had been at this for a while. My suspicions were confirmed when Anna let out a piercing shriek, coming undone and spurting her cum all over herself and Elsa before going soft. I watched, unable to pull my eyes away as Elsa's thrusts quickened, her grunts and groans telling me that she too was releasing a torrent of seed inside of Anna, filling her up. A string of expletives left her, making my ears blush. When Elsa finally pulled out, my eyes widened at the sight. Anna's asshole was gaping, cum flowing out of it. Elsa's cock may have been slightly shorter than her sister's, but the blonde definitely ranked higher in terms of thickness. The two sisters attempted to catch their breath, sharing delicate kisses and loving cuddles before their eyes eventually fell on me.

A/N - Considering Iduna has been psyching herself up for ages to open that conversation, this encounter makes the whole ordeal seem rather anticlimactic. Ah well, we shall see what happens in the next chapter. At first, I thought I would include more build up, but patience is a virtue I do not possess. Until next time, stay hydrated and wear a mask x