Archive of Our Own ^beta

Horror was growling as he stalked through the dark halls of the castle. He knew there was something weird with his body from the moment he woke up, but it was only now that he knew what. 

A heat.  

His last heat was long ago, before his Underground was hit with the tragedy of Core failure and overwhelming hunger that made summoning even the weakest attack close to impossible, let alone ecto and enough magic to fuck someone for a week straight. 

Apparently, all this time in Nightmare’s care with enough food to feed his large frame, that grew to be twice the size of a normal Sans due to consumption of human flesh and DETERMINATION their bodies carried helped with that.  

He was dragging his axe on the floor, sniffing the air, his lone red eye blown out as it searched for a fitting victim of this peculiar type of hunger. He felt the itch in his soul to breed, to drag someone into his large nest in his room, built with all the pillows, blankets and sheets he could get without raiding everyone’s private room and triggering the alarms they all had on their doors.  

The castle was silent, the halls bathed in the silver light of the full moon that filtered through the high windows. It was quiet, his logical mind told him that everyone was asleep and, in their rooms,, but his instincts disagreed... he knew someone was outside, was vulnerable. 

A prey. Someone for him to sate this burning need gnawing at his mind.  

He reached the living room that was connected to the kitchen... his conscious thought didn’t understand, he already had enough food stashed in his room, but his instincts... he picked up the axe from the floor and with stealth unfitting his massive body moved towards the room with weak light illuminating the figure inside. 

It was hard to judge without the complicated outfit and always present fluff, but the glimpse of eyelights, one white and other red, as well as the red scar under one eye revealed who his victim was. 

Cross. 

The little soldier who joined the gang not that long ago, the one that always reveled in any attention Nightmare and the others would grace him with and the one to always puff up like offended puppy when Killer teased him... quiet, anxious about his place in the gang, serious and as Killer liked to say ‘with a pole stuck up his pelvis’ and yet Horror had a soft spot for the former royal guard, the one that asked with a soft blush if he could use Horror’s kitchen and bake a pie for them all... only person except Nightmare who he allowed into the room when he was cooking. 

Horror put his axe into his inventory, he didn’t want to scare the little soldier and he KNEW Cross won’t attack him. There was no need for a weapon to subdue this one, his instincts may dictate his actions right now, but he still had enough conscious thought to remember. 

In the castle there was a system. Red to stop, yellow to pause, green to go. 

Cross knew, Nightmare told him even if the skeleton was avoiding everyone’s attention for a week afterwards as if they would jump his bones just because he knew the rules... but now that knowledge will come in handy. 

Horror’s eye was focused on Cross as he filled a glass with water and drained it. He saw Cross was sweaty, his ecto spawned and sweet scent surrounding him... His little snow puff... his little prey was in heat as well. And in a submissive one. He could see the small, perky breasts protruding through the thin T-shirt and the small patch of wetness on his shorts.  

Once the object that could end up as a possible projectile was put away Horror stalked to his little prey and backed him up against the counter, crowding against his back. 

Cross tensed feeling the much bigger body against his back, unmistakable with anyone, but one thing was different. The solidness of ecto and the hard length rutting against his ass. He took a shaky breath and caught hint of heat scent that brought a bright blush to his face. He started shaking feeling Horror sniff and lick his neck, his arms holding Cross in place.  

Horror was in heat just like him and he was here...  so close ... Cross didn’t know what to do. 

“H-horror!?” Cross squeaked out when he was picked up and thrown over Horror’s shoulder and carried off from the kitchen through the dark halls. He tried to free himself from the hold but stopped at the loud growl that left Horror’s throat, the hold tightening and bordering on painful. He stayed still and silent until they reached Horror’s room with a fluffy nest in the middle of the bed. 

Horror threw Cross into the nest, the other bouncing on it slightly to then look at Horror that crawled over to him, his red eye a slit. Cross tensed expecting Horror to continue with the pushy moves but instead he was nuzzled softly as Horror purred. 

“You know the words, my little snow puff.” Horror said as his hands snuck under Cross’ clothes and roamed the heated ecto with utmost reverence, the bigger skeleton extremely careful about his clawed fingers.  

Cross blushed at the sweet nickname and the gentle treatment, relaxing in the nest smelling strongly of the ex-cannibal. His initial nerves waned, to make place for excitement as his soul trilled with promise of relief from his heat. Horror smirked and undressed the skeleton under him, brushing his fingers over the sensitive nipples when taking care of the shirt to then take off his shorts and lean down. 

Cross shivered in need at the hot breath over his soaking folds, a whine building up in his throat, changing into a moan when something hot and wet pressed against his pussy, pushing between the folds and wriggling inside. 

Horror hummed at the sweet taste with the hint of chocolate. Cross moaned softly, arching his hips into the touch as Horror added his fingers to start stretching the skeleton out. Cross was clutching at the sheet under him, his legs twitching as Horror’s fingers pressed against his sensitive walls.  

“You are so pretty, snow puff~.” Horror purred as he emerged from between Cross’ legs, his teeth still stained with purple magic. Cross blushed and started shaking his head, his teeth parting to utter a complaint only for Horror to thrust his fingers deep into his pussy and get a loud moan, “Yes, you are, my lovely Cross. Such pretty ecto, so soft and bright, and this color~… can’t wait to fill you up, make this pretty stomach full of my magic, to make you look heavy as if you were carrying a child. I will take good care of you precious~.” Horror purred, his eye dilated ferally. 

Cross gulped, his face bright purple as his pussy fluttered around Horror’s fingers. By the way Horror smirked it was clear he felt that, as well as the wetness that followed Horror’s words. The big skeleton retreated his fingers, showing the covered in slick fingers before taking them between his sharp teeth and closing his eyes, clearly enjoying the taste.  

Cross whined needily, subconsciously spreading his legs wider and Horror grinned, “Soon, snow puff, I will give you all you need. I will make sure that heat of yours is gone from your mind and body." Horror took off his shirt, revealing lean burgundy red ecto and palmed the obvious bulge in his shorts, “I will make it so only I am on your mind... I will imprint myself on your body. You will only think of me and how loud I will make you scream~." He purred taking off his shorts, letting out his big cock with knot at the base. 

Cross looked at the length anxiously, well aware how much smaller he was than the other. Horror took hold of Cross’ legs and threw them around his hips, “Relax snow puff, I promise I will go slow.” 

Cross relaxed a little, taking a deep breath. Horror is a Sans, Sanses take promises seriously... and it is Horror, he would never hurt him. He never hurt him and always took care of him from the shadows... 

Cross looked at Horror and whimpered, the bigger smiling and leaning down, kissing him slowly, “Use your words Cross~.” He cooed and waited for the other’s heat addled brain to catch up. 

“Green...” Cross whispered against Horror’s teeth and got a deep kiss in reward, their tongues tangling languidly as Cross eyes fluttered close. Horror let his hands wander over Cross’ body, caressing the soft belly and squeezing the muscled thighs.  

Horror’s hand sneaked over to tease Cross’ clit making the other break the kiss to gasp as his body arched into the touch making Horror purr in satisfaction.  

The big skeleton lined up his dick with Cross’ pussy, rubbing the tip up and down to lube it with Cross’ slick, the pussy squeezing around nothing.  

“Are you ready snow puff?” Horror asked, nuzzling Cross’ neck lovingly. When the skeleton nodded, Horror slipped in slowly, groaning as the tight pussy squeezed around him.  

He moved inside, keeping a steady pace, pausing whenever Cross whimpered weakly. Slowly his knot was resting against Cross’ folds, tip of his dick making a slight bulge in Cross’ ecto stomach. Horror pressed on it gently, making Cross groan as his eyes rolled back into his skull, his fingers tearing at the sheets underneath.  

Horror straightened up, holding back his instincts that screamed at him to wreck the smaller skeleton instead looking at Cross with adoring gaze, “You look ravishing snow puff. I want to fuck you so hard, make you breathless... Ah~...” Horror rocked his hips slightly with a groan making Cross moan. 

The other felt his soul pound hard in his chest at the words from the feral skeleton, he wanted that, he needed to be wrecked and so. One word left his mouth, “Please~...”  

Horror’s pace stuttered for a moment, his eye connecting with Cross’. The other was flushed in embarrassment, but clearly eager. Horror purred with a smirk, “How could I refuse such a lovely request?” He said, his voice rough with desire. 

He slipped his dick out until only the tip remained and snapped his hips forward getting a pleasured scream from Cross that untangled his hands from the nest and gripped Horror’s thick ribs, the tall skeleton’s shoulders being well away from his grasp. 

Horror growled with feral satisfaction as he started a brutal pace, his knot teasing Cross’ pussy with each thrust going a little deeper. He leaned down and licked Cross’ cheek, cleaning it from tears to then go down and nip Cross’ neck. 

Cross freed one of his hands from Horror’s ribs and put it over Horror’s neck, tugging gently, hoping he won’t have to ask for what he wants because he knew unless Horror stops or slows down his pace, he won’t be able to get enough air into his chest to speak.  

Cross thanked the gods that Horror understood and lapped at his neck to then bite it, purring around the bone in between his teeth. Cross angled his head to show more of his neck moaning breathily as Horror continued to thrust, rocking his whole body. 

“Are you close snow puff? Do you want to come?” Horror said gruffly and Cross nodded desperately, needy for release. Horror grinned and straightened up, taking a firm hold of Cross hips, “I will make you see stars little snow puff.” He purred and picked up his pace, his thumb rubbing Cross’ clit and when he felt the other start tightening around him, he snapped his hips forward, forcing his knot inside with a lewd pop as Cross moaned loudly reaching his orgasm, whining satisfied when Horror came with a grunt flooding his insides with hot magic. Horror rocked his hips slowly, trying to milk everything he could into the other’s slowly distending belly, purple ecto slowly staining with the blood red of Horror’s cum.  

Cross’ pussy squeezed around the dick in it, its owner breathing heavily with eyes half lidded. Horror was rubbing Cross’ belly, purring softly, some feral need in his satisfied at the sight of the debauched monster under him.  

It didn’t take long for the knot to deflate and Horror to start thrusting again, his off period done with quickly, causing his need to breed to return at its full intensity. Cross’ hands fell limp onto the bed as he let Horror do well on his promise to fuck his brains out. He was letting out soft moans as his body twitched weakly, his soul screaming out its pleasure as Horror helped them both satisfy their heats. 

Horror was thrusting quickly, one of his hands holding Cross’ hip, making sure he maintained the best angle to make his snow puff see stars while his other hand started roaming over Cross’ body. 

He went over the smooth thigh, the pudgy stomach filled with magic to then reach those perky breasts. He tugged on the stiff nipple, tweaking it with his thumb to then splay his hand over the breast and grope it, getting a lengthy moan from breathless Cross whose eyelights changed into little hearts, fuzzy at the edges.  

Cross’ chest arched into the touch, whining when Horror let go of his breast only to moan as Horror took hold of his other, neglected breast, massaging the mound slowly, “So soft and pretty and just for me~.” Horror murmured lovingly making Cross’ blush to deepen. Cross tried to cover his face with his arm only for Horror to let go of his breast and grab that arm in a gentle hold, “Ah-ah, no covering up, snow puff. I want to see all of you. Every little detail, every shift in expression, each twitch of muscle... Let me see how good I’m making you feel.” Horror said calmly, still keeping a bruising pace. Cross could do nothing but nod dumbly, dropping his arm back on the bed and close his eyes to at least not see Horror’s amazed, loving gaze directed at him.  

Cross couldn’t handle that much tenderness, he didn’t think himself deserving of it, not with all the sins staining his hands, not with him still trying to prove himself useful to Nightmare and the gang. He didn’t seem to get it through his thick skull that he didn’t have to prove himself in any way, the gang already accepted him and will not give him up for anything. Hopefully Horror will be able to show him how precious he is through this heat. 

Horror picked up his pace feeling that Cross was reaching his limit for the day, wanting to make him come last time before that, “Come on, love, my cute snow puff, come around my cock one more time. Let me see as that beautiful expression reaches its climax.” Horror growled with a rough note in his voice, his red eye eating up every little detail he could from Cross body. The slight shaking, the purple tears falling from his eyes, the blush coming all the way to his shoulders, the bite left by Horror on his neck where Cross barred his delicate vertebrae to the other. It all made him that much more eager to show his partner a good time as he pushed his finger in with his moving dick and how he used his thumb to rub on Cross clit in quick, rough circles. 

Cross could feel his vision slowly blacking out as his body shut down from the multitude of sensations. 

Horror grunted feeling his peak approaching and squeezed Cross’ tummy, that last bit of stimulation the other needed to topple over his next peak. Cross could feel Horror’s knot joining them again, more hot magic stretching his stomach out before he lost consciousness, slipping into overstimulated bliss 

--------------- 

“You did so well snow puff, so lovely for me. You were so beautiful, so open and accepting of all I gave you.”  

Cross slowly came around to hear Horror’s soft voice and feel warm cloth sliding over his body, cleaning any stickiness that was left from their previous tryst. 

“How long...?” Cross managed to get out through his scratchy, patched throat. He felt a bottle of water pressed to his teeth and sipped slowly for a moment. 

“A few hours since you fell asleep and still a few days of our heats... you hungry, snow puff?” Horror murmured and Cross nodded, hearing some shuffling afterwards, “Open up...”  

Cross opened his mouth and hummed happily at the taste of chocolate muffin Horror gave him a morsel of. He ate the bit and opened again unprompted, eager for the homemade sweet made by Horror.  

The other chuckled quietly as he continued feeding Cross slowly, satisfying his need to see those he cares about fed and happy. The other didn’t even open his eyes and Horror felt warm inside at the level of trust that required... the trust that Cross gave him easily even if he wasn’t the most pleasant looking and most would rather stab him than place their trust in him.  

Horror fed Cross three muffins and smiled as the skeleton yawned, still tired despite his short nap. He put his hand over Cross’ check, his adorable snow puff nuzzling into the touch, “Sleep for a while longer, there’s still so much to look forward too, you will need your energy.” He purred and kissed that cute sleepy frown, groaning satisfied when Cross opened his mouth letting Horror deepen the kiss. 

Cross’ shaky hands weakly tugged on Horror, wanting the skeleton to lay down close to him, the ex-cannibal followed the hint and laid down, holding Cross close and enjoying the downtime.  

After the nap there will be more excitement waiting for them.