Chapter Text
Noelle had been feeling weird for the past couple of days, but she couldn't figure out exactly why. December had left town a couple of days ago on her weeklong camping trip with Dad, but Noelle had been without her sister for longer than this before. She’d been sleeping in the Dreemurr’s spare bedroom since her dad left town, but she’d had sleepover after sleepover before and been just fine then. Could it be that her twelfth birthday had been last week? People around her acted like it was some all-important milestone, but she didn't feel much older than she used to be.
Maybe she was just aroused? December and her always played such delightful games together, chasing through the woods and pinning each other down as they locked antlers and fucked each other silly. It was easily Hometown’s worst-kept secret that basically everyone in town was some flavor of degenerate though, so she wasn't at risk of getting in trouble or anything.
Noelle trotted out to the breakfast table to see Toriel sleepily arranging the plates, the scent of eggs and bacon wafting through the air. The Holidays were all morning people, but the Dreemurrs absolutely weren't. They had joked many a time before that something must have gotten mixed up in the hospital though, since Asriel was up at the crack of dawn every day, and Dess frequently woke up in the PM and slept in the AM.
“Good morning my child! How are you… *yawn*, feeling today?”
Noelle gave her a thumbs up, grabbing a box of cereal off of one of the shelves. Asriel waved hi to her and she started to wave back before getting a pang in her gut. Was she that hungry, or was something else going on? She focused on eating in an effort to soothe her stomach.
“Ah, Kris! How nice it is to see you this morning, dear!”
Kris clearly couldn't handle Toriel’s exuberance, flattening themself backwards like they were being pushed by a mighty wind. They grumbled something unintelligible as they jumped up to their seat at the table. Noelle found herself drifting off in thought, her eyes gazing at their shoulders.
Had Kris always been so… freckled? Their shoulders looked like the constellations her sister had shown her, and she wanted to trace them with her tongue.
Woah, where had that come from? Noelle was no stranger to desires of the flesh, but they’d never been this specific before. Usually she just longed for a warm embrace or gentle kisses, not this burning heat in her gut.
Noelle excused herself from the table and ran up to the room she was sleeping in. She checked her temperature, smelled herself, did a full diagnostic. Her mother had told her exactly what to look for, and Noelle’s dread rose within her with each checkmark on the list.
She was going into rut. There had been much speculation around Holiday Manor as to which set of mating habits she’d express considering her HRT, and she had clearly lost the coin flip. No desire to nest, no enhanced sense of smell, nothing. She didn't fit a single characteristic of an AFAB estrous cycle, and she was checking off every single indication of ‘male’ rut.
She sent a panicked text to her mother, the words only mildly garbed as “in rut whatddoido?”
She anxiously awaited the double checkmark that would indicate her mother’s viewing of it, but after five minutes passed she gave up on that particular goal.
“My deer, are you alright in there? You hardly finished your breakfast, is everything okay?”
Toriel entered the room after her questions, sniffing the air in confusion as she began to understand.
“Ah, I see. I’ll call your mother as soon as I can sweetie. I don't know how busy she is today, but she’ll know what to do I'm sure. In the meantime, is there anything I can do for you?”
Toriel kneeled at the edge of Noelle’s bed with a look of open invitation, but Noelle couldn't accept her offer. The woman was gorgeous in every way, but Toriel wasn't hers. The growing voice in her gut wanted Noelle to grab one of her mates and pump them full. Normally she'd go straight to Dess with something like this, but with that option unavailable, her other siblings would have to be enough.
“Could you… get Kris? I feel like… I need them here with me, please?”
Toriel nodded in understanding, a small, knowing smirk on her face.
Kris was a little nervous, but mostly just worried. Elly had looked kinda sweaty before she ran to her room, and then their mom came out and sat them down for a talk. She’d said that Noelle was growing up, and part of that growing up was the feelings she was experiencing. Kris's puberty had started astoundingly early in their life, so they kinda knew what she was going through. They wanted to help her however they could, so their mother directed them to Noelle’s bedroom with a coy smile. She joked about them being ‘properly stretched,’ but Kris didn't really understand the humor in it.
It smelled… not bad in here, but it certainly smelled a lot. Kris wandered over to Noelle’s side, the pungent aroma only increasing as they got closer.
You ask Noelle how she wants you to help her.
“U-um, I'm going into rut, so… I n-need to uh, ffffuck you-imsorryimsorryimsorry!!!”
You take a moment to process that, then chuckle. You tell Noelle that you've explored each others’ bodies with your tongues before, there was no need to be embarrassed.
“Faha, yeah… I um, I might get a little… possessive, though? There’s these instincts that are screaming at me to just… keep you here until my uh, rut is over.”
You ask Noelle how long that would be.
“Uh, the week? Today’s Monday, so… next Monday?”
Kris gulped audibly. They had done some extremely lewd things for a pre-teen, but a full week of nonstop sex sounded like a bit too much.
“But um, I can control myself! …Probably?”
Kris thought about this for a moment. The few times they had seen Noelle and December fuck, Dess had looked like she was trying desperately to escape her little sister. When asked about it afterwards she’d explained to Kris that she loved the feeling of losing so completely, unable to prevent anything that could possibly be done to her. No begging nor pleading, no threats nor escape attempts would be enough to convince Noelle to stop fucking into her. It had given Kris a lot to think about since then, but surely Elly wouldn't be so intense with someone other than her sister, right?
Kris leaned in and sealed their fate with a tender kiss.