Notes: A touch of modern AU with this one. Just think of the sisters sharing an apartment/house together.

"Elsa?"

"Mmm... Anna~"

Ida blinked, not quite expecting that response from Elsa, the other girl looking listless and flushed, her head lolling over her chair's seat, hands hidden underneath her study desk. Brow quirked, Ida knocked on the open door to get her sister's attention. "Erm... Elsa?"

"Oh sh- Ida!" Elsa scrambled upright from her seat, eyes wild and cast over her twin with alarm, arms flying over her desk and scattering a few papers. She inhaled in a frantic gasp, clearing her throat as she stammered, her voice oddly raw and pitched, " I was just, um- I mean-! W-when did you get home?"

The older sister regarded her twin's strange antics. "Half an hour ago. I was just coming to check on you."

"O-oh!" Elsa breathed sharp, her body twitching and squirming weirdly on her seat, hands trying desperately to seem occupied. She tried to smile, the force of her effort straining visibly over her cheeks. "I was um... t-taking a nap," she stuttered out, her gaze darting downwards now and again at her lap. "I-I've been working on these papers a while a-and I think I just um... fell asleep, yes."

Ida blinked again. "I see," she said, not at all convinced. "You were mentioning Anna?"

Elsa's face seemed to burn with red from the neck up, words clumsily spilling from her lips. "W-Well, I was dreaming! I know it sounds silly, but I was dreaming about her. I mean, it's embarrassing to admit, but i-is it really surprising?"

In retrospect, it wasn't all that hard to imagine that Elsa would be dreaming of Anna in any way, given their relationship. Ida relented a little with a nod and a slight tease of a smile. "I suppose not..." she began, "I just thought she might have been here since you were mumbling her name for a bit."

"A-Anna? Here? No that's silly!" Elsa insisted with a laugh a touch too high an octave, tugging at the collar of her shirt. "She knows that I have work that needs doing, after all, so she certainly wouldn't be around to bother meEE!"

Ida backed away a little at Elsa's sudden squeak, the younger sister suddenly jolting upright with a whiny cry that Elsa very silenced with both her. She watched Elsa go wide-eyed and flush a deep crimson, fidgeting as though in pain(?), muted utterances slipping between her enclosed mouth. Ida stepped forward, concern etched on her face. "Elsa, what's wrong? Are you hurt?" she asked, edging closer to examine her sister.

Elsa held a hand up to keep her away, shaking her head vigorously, her eyes unfocused. "M'fine! Completely f-fin-nnnh...!" she mumbled, swallowing thickly, her eyes darting down at something underneath the table as certain words from her mouth seemed to slur and heighten in pitch, "J-just a slight headache. I was working pretty h-harrr..." Her head swiveled upwards for a moment, teeth caught on her lower lip, not quite as focused on her sister as she'd have liked.

"Are you coming down with something?" Ida said, worry creased on her forehead, leaning close to the table, much to Elsa's seemingly growing discomfort, if her harrowed breathing was any indication. "You have been working yourself hard lately."

"I'm perfectly- mmmm~" Elsa's body bucked rather uncomfortably like a bolt of lightning had surged through her spine, her mouth moving though not quite forming words, one hand disappearing under the table. "I-I... I ah..."

Unable to bear just watching anymore, Ida closed the distance, her hand already reaching to feel for her sister's temperature.

"W-wait, Ida don't, I'm f-"

A soft, delicate hand brushed over Elsa's neck without giving her a chance to protest, fingers curling over her raw throat firmly.

It was all Elsa could do not to scream as her head lolled upwards, eyes seeing stars, her mouth clamped over her free hand, body seizing oddly and taking all her constraint not to contort painfully. She twitched once, twice, thrice, then after an eternity, released a breath she'd been holding with a deep shudder.

Ida didn't seem to notice, focused on trying to feel for Elsa's temperature.

"Good grief, you're practically overheating, Elsa," she tsked, moving her hand to her sister's sweat-matted head. "I'm going to have to insist that you get some sleep for the rest of the day. Drop whatever it is you're working on and just head to bed, alright?"

"Mmm..." Elsa hummed distractedly, her breathing deep, though not as erratic as it had been as she slumped against Ida's touch.

"I don't know what's gotten into you," Ida sighed, running an affectionate hand over Elsa's blond locks, "but get some rest, alright? I'll make you some soup when you wake up."

"Mhmm..." Elsa nodded, not quite trusting her words, or able to form them properly (what were words again?), her head simply taking in the gentle caress of her elder sister's touch whilst she discreetly combed her fingers into a mop of red hair hidden just underneath the table. Warm little kisses dotted the skin of her thighs and Elsa made little effort to stop them, simply murmuring under her breath, eyes staring listlessly up at Ida's beautiful face.

Ida didn't seem to catch the strange look she was getting, instead settling to place a fond kiss over Elsa's head and patting her hair gently. "Have a good night, Elsa," she smiled softly at her one last time before drawing away and heading out the door.

"Well?" Sofia asked expectantly, looking up from her book to regard Ida.

With a resigned sigh as she settled for a seat next to Sofia, Ida nodded. "Yes. Anna's in there with her."

"I knew it," Sofia grinned to herself. She'd had an inkling of Anna's 'sexy secret surprise' for Elsa after the latter girl had been working herself stressed the past few days. Anna had revealed nothing in her text except that there would be a lot of 'under the table' liaisons involved. "Anna's absolutely terrible at being subtle."

"Indeed," Ida allowed herself a soft chuckle, cradling her chin over her palm. "I think I might have interrupted, in fact, not that it stopped Anna." The blonde was far from stupid, after all, and besides that, Ida had caught a glimpse of Anna's sock-clad feet from the gap underneath the table. Discretion was never Anna's strong suit, and it had taken every ounce of control Ida had not to laugh or blush at the brazen display.

"I'd have thought you'd see fit to stop them," Sofia teased.

"Far be it from me to stop Anna from administering her 'surprise', not that I'd be able to stop her even if I wanted to," Ida confessed, looking aside and to the door to Elsa's room. "So I chose to play along with their poorly concealed facade. I didn't see the harm."

"Is that why you took so long to check?"

"Yes, well," Ida cleared her throat, pointedly not looking Sofia in the eye. "I might have... inadvertently helped things along, so to speak. Just a little, though."

Sofia stared at her, silent at first, then wide-eyed. "You were getting off on it!" she accused.

Ida still wasn't looking at her. "Must you make it sound more tawdry than it is?"

"Like hell I am," Sofia retorted, "You liked doing that to Elsa, didn't you?"

Ida said nothing, still staring at the door to Elsa's room with a vacant expression as though she hadn't heard. There was a hint of redness tinting her cheeks, and the subtle start of a smile that wouldn't have been out of place on Sofia instead: wicked, hungry.

"I think I'll get started on that soup for Elsa," Ida hummed, her voice tickled with an odd mirth that her sister wasn't used to hearing. She rose elegantly from her seat, her smile not quite leaving her whilst her mind grew occupied with thoughts that made her flush run darker still.

Sofia couldn't decide if it was scary or attractive. "Not the only one bad at hiding things," she murmured.