Chapter Text
The doors swung firmly shut with an ominous thud and Cross had to keep his magically created ears and tail from drooping. It was his own fault for insisting he didn’t want to choose another day for pet play. Cross had been so looking forward to it he’d convinced himself it wouldn’t matter if Dream had to leave him for a while to meet with Nightmare. Now that it had happened, Cross realized it did sadden him far more then he’s been expecting. That part of himself he only truly listened to when he had his large canine ears and long tail was quietly worried about if Dream would come back for him or not. He knew of course that Dream would. Cross just didn’t like being away from his side and liked it even less durning pet play days.
A quiet yip of a laugh to his left reminded him that wasn’t the real issue though. The real issue was that he’d been left with Killer, both of them having been told to ‘play nice’ while their ‘owners’ talked. He hadn’t realized that Nightmare and Killer did pet play as well though Cross supposed it made sense. Nightmare tended to treat the Bad Sans more as semi-intelligent pets then people anyways so pet play with one he was fucking wasn’t that much of a surprise.
Killer hummed and Cross glanced at him out of the corner of a socket, one ear pivoting to focus on the other ‘dog’. Killer’s ecto sculpted ears were similar to his own, if smaller, but his tail curl back up on itself. Most of the time it rested against his back in a loose coil. But when it wagged, like it was slowly doing now, it seemed more like a scythe cutting back and forth through the air.
Killer turned to shoot him a curious look with a wide smile and Cross’ ears pinned back without his even needing to think about it. That reaction seemed to amuse Killer because the smile widened and his own ears cupped forward. Cross did not trust that look on Killer’s face. He wanted to tell Killer to not even thing about it. He could have had less than half the experience he did with Killer and still known the skeleton was up to something. But ‘pets do not speak’. So as Killer turned towards him and began to saunter casually closer Cross did the only thing he could. He growled low in warning. Killer, predictably, ignored it.
Cross tensed, turning to face Killer as his tail stiffened and his growl grew louder. Killer kept coming, moving to circle around him. Cross kept his sight locked on the slightly shorter skeleton, posture stiff as he traced Killer’s movements as far as he could around his right side. Then he whipped around to keep watching him and in that moment, just as he looked over his other shoulder, Killer’s hand snapped forward to hook two fingers into the muzzle still secured over Cross’s mouth.
“I like this~,” Killer cooed in a quiet mocking tone, “Who did you growl at to earn this? I would have though little Golden Boy liked your teeth on him.”
Cross snarled. He’d been absolutely justified in biting Ink. Cross had growled in fair warning. He was not a people kind of dog and had given every warning available to him. The fact that Ink ignored all that wasn’t on Cross and biting him had been pretty satisfying. Unfortunately, it also got him muzzled because apparently good dogs shouldn’t bite people without command.
Killer slipped a finger through a gap in the muzzle to tap Cross’s teeth. Cross’s eye lights blazed with irritation and he elbowed Killer hard in the sternum. Just under that glowing target of a soul he was making so temptingly easy. Killer grunted, folding over the blow just a second before wheezing out a laugh and grabbing the inside of Cross’s wrist, twisting it under and back until it was contorted painfully behind Cross. Cross grunted at the discomfort but was already moving. He turned into Killer’s grasp and decked him, forcing Killer back with a pained grunt of his own. It freed his twisted arm but Killer still hadn’t let go of the muzzle.
Then Killer retaliated, yanking Cross close by the muzzle and biting one of his purple dog ears hard. Cross yelped, shaking his head hard even as his hands darted out to grab Killer by the wrist and clavicle. He managed to rip away the hand on his muzzle and shoved Killer against the nearest wall. That had really fucking hurt his ear! He had the strong urge to drop it with a whimper of pain but he wasn’t about to let Killer win. Killer hissed in a small, sharp breath as his skull smacked against the wall but his expression didn’t chance. Like the ass was enjoying this. Then Cross realized he probably was and Cross hated the warm thrill that sent through him.
Killer lashed out with a kick and Cross dodged back but Killer was on him in a second knocking them both to the floor. They grappled, punching and grabbing at each other. Killer could have used his teeth but he didn’t. Cross would have if he’d had even a second to get the muzzle off. Surely being attacked was an exception to the biting without orders thing. And he wanted to hear Killer’s yelp of pain when his ear was bitten. Cross managed to flip them over and tried to grab one of them but Killer twisted it away, grabbing Cross’s wrist and rolling to dislodge Cross.
Cross fell sideways onto his back with a wheeze and tried to scramble up but Killer used the grip on his wrist to twist Cross around so that he ended up on his knees with his chest shoved against the floor. Before he could shove himself up, a sharp point appeared in his vision. Killer had a small bone attack in hand and had it poised threateningly over Cross’s socket. Cross tried to snap his free hand up to shove the attack away but Killer moved faster, shoving the bone into the narrow gap of Cross’s radius and ulna and effectively pinning it in place long enough to create a new attack to threaten Cross with. Cross snarled, staring angrily at the attacks and then glaring at Killer. It hadn’t surprised him at all that Killer would violate the ‘pets don’t speak’ rule but this!
Killer giggled, “Now don’t give me that. I was only told no knives. But of course Crossy doesn’t want to be a bad dog, does he?”
Cross growled, bristling at the comment. A part of him really didn’t want that. He loved when Dream told him he was being a good dog. More than the fact that it was part of the play, it offered a simply joy that Cross could easily accept. A sort of praise that Cross couldn’t convince himself he didn’t deserve and he loved it. But being told he was a bad dog… Cross flattened his ears.
That didn’t stop Killer from laughing again and leaning over Cross to whisper, “You know I can smell how exited you are, right?”
Cross tried to object but it was hard. He’d been mildly exited when they arrived for Dream’s meeting, his mind wandering through what might happen when they got home afterward. But then the fight, fast and feral and making his magic sing with the adrenaline, had made it so much stronger. His bones were warm, his pelvis especially. It was almost throbbing with the urge to form something.
“Oh, yeah,” Killer murmured, “Very excited. I’d love to help you with that.”
Killer rut against him awkwardly, hampered by the slight height difference, but that didn’t keep Cross from feeling the hardness tenting Killer’s loose shorts. The throbbing in his pelvis got stronger and Cross’s glare wavered. He tried to growl again but the sound came out unsure and almost nervous. Killer ground against the base of his tail again with a hum.
“Ya wouldn’t even have to feel guilty,” Killer whispered, nuzzling Cross’s ear. “We were told to play nice, remember? What’s nicer than helping out a bitch in need?”
That should have pissed him off. Should have had him snarling and fighting with renewed vigor. Instead Cross just kept back a whimper as his magic reacted to the suggestion and his pussy snapped into place. Killer clearly noticed because Cross could feel him chuckling.
“Good boy, but let’s tie you down just to be sure.”
Cross shivered at the praise and was too slow to react when Killer untwisted his arm, pressed it flat to the floor, and drove the remaining attack between the bones of that limb as well. That left Cross pinned down with his hips in the air. Vulnerable. Captured. Defeated. Cross squirmed, tail starting to lift without his meaning for it to. He would most certainly feel guilty about this later in his proper headspace, but right now, pinned down by a strong opponent, the feelings were something else entirely.
Killer shifted off of him and pulled Cross’s shorts down to his knees, snapping the button fastening in the back that let him pull them comfortably up over his tail. Cross shifted uncomfortably, a part of him wanting to kick now that Killer was off him. But then Killer growled, soft and pleased, and a firm tongue lapped up along his folds making Cross start. The lick came again, slower, pressing deeper, and Cross had to fight to keep the sounds to nothing more than a muffled pant as he squeezed his sockets closed. He could feel a flush warming his face from embarrassment and how good that felt. Cross had his tail curled up as far as he could as Killer ate him out, shivers of arousal racing over his bones.
Then Killer pulled away with a lustful groan and Cross felt a hand grip his pelvis. A rustle of clothing and Cross just had a moment to pant, “Wait, don’t…”
But it was too late. Killer lined up and thrust in hard, cutting off the rest of what Cross had been trying to say by turning it into a yelp of pleasure. Cross arched, his skull coming up and his sockets half lidded as Killer started to pound into him quick and deep, just like a dog, pushing Cross even deeper into the role. Cross whimpered with need, fingertips digging into the floor as the barrage of pleasure scalded him. His soul pounded as he gasped and groaned, unconsciously pushing back into the thrusts, trying to take it even deeper. Above him, Killer moaned loudly, gripping Cross’s hips hard enough to leave little scratched where his fingertips pressed against the bone.
“Damn you really do make a great bitch and you aren’t even in heat.”
Killer leaned over him as Cross panted out a moan, a breath tickling Cross’s ear. Cross tucked his chin down so Killer wouldn’t see just how bright his face had flushed. Cross felt like he was drowning in pleasure. His increasingly sensitive clit was bring rubbed with each rapid thrust and Cross could feel himself getting so close. Until something started to swell at the base of Killer’s length.
Cross gave a surprised yelp, shooting up onto his hands as the growing thickness caught slightly only to pop free. Killer pressed it back in with a groan and kept right at it even as Cross squirmed, chest dropping again as his hands scrabbled for purchase. He didn’t even notice that the bones pinning his arms were gone. He was struggling not to come simply from the growing undulations along his walls. Killer gave a panting laugh as he pulled back again, slowly stretching Cross open in a way that set him shuttering with painful pleasure.
“Like my knot, bitch? Gotta be accurate with parts in pet play so I made this juuuuuust for you,” Killer crooned.
Cross shook his head furiously, trying to deny how amazing it felt as the knot popped free. Killer grunted and thrust back in.
“And just think. Ya could be doing this to Golden Boy. Fillin’ Dream up, making him scream and squirm as yer knot stretched him wide.”
Cross’s panted hard, pressing a hand to his muzzle as if he could cover his mouth and muffle the noises coming from him as images of what could be combined with what was actually happening.
“Ohhh~!” Killer groaned, “Bet he’d moan all pretty and clench nice for ya. Maybe beg a little as ya filled his belly with puppies.”
It was all too much! Cross moaned, tightening around Killer as he tried to pull his growing knot free again. It was getting so big! Stretching out Cross’s folds and dragging his buzzing clit against it. Killer groaned again.
“Yeah! Just like that. Or, maybe, with how tight you’re getting…” Killer’s voice dropped to a panting whisper as he leaned in as close to Cross’s ear as he could. “…you’re thinking of sweet little Dreamy doing this to you.”
Killer emphasized the point by suddenly thrusting back in. Cross let out a high keening whine, arching hard as he clamped down around Killer’s length and came. Killer moaned out a swear filled sentence of his own approval at the pressure on his knot, holding Cross tight and resuming his pace with shallow, rapid thrusts. The knot was too big to be pulled out. Only swelled out against Cross’s pulsing walls and inched deeper inside, dragging Cross’s peek higher and higher until finally Killer stopped with another low moan. Cross fell limp as heat flooded him inside, the pressure forcing his magic to stretch even more. Cross could feel each pulse of Killer’s cock as he continued to come.
For a while, Cross could only lay there panting with his chin resting on the floor. His knees were sore in a remote sort of way and his tail felt like it had been caught over Killer’s pelvis. Cross couldn’t move it though. He was still sunk up to the tips of his trembling ears in orgasmic bliss and Killer’s silence only let him enjoy it more.
Then he heard the footsteps. His ears snapped up and he tried to shift away from Killer’s slowly shrinking but still huge knot. That caused Killer to finally give a yelp of his own but then he rumbled and started to come again which in turn made Cross give a strangled moan just as the doors swung open again. The steps paused and Cross hid his face in his arms even though he felt the embarrassed and ashamed flush burning right down to his sternum. He could feel Dream’s warm presence washing gently over him and guilt started to creep through him. What would Dream think finding him like this? On his knees trembling on the floor with pleasure still very clearly tied to Killer. Killer barked a greeting and Dream gasped. Cross flinched, curling into himself as his ears pressed down.
“Ohhh, Nighty, look how well they’re getting along!” Dream cooed, tone bright and excited.
Cross, almost not believing it, peeked up to look. Dream was beaming at him, radiating with barely suppressed positivity that had Nightmare snorting as they moved closer.
“I don’t know why you act so surprised. That is what they were told to do,” he grumbled.
Despite that, he still reached over to pet Killer who woofed happily. And started wagging his tail. Cross let out a surprised moan, his back arching up. He could feel each wag shifting Killer inside him, tugging softly on the knot still pressed against his walls. Another small peek washed through him. The embarrassment hit a moment later as Nightmare chuckled and Dream knelt in front of Cross. He’d come in front of an audience! From someone other than Dream. He didn’t…he hadn’t…
One of Dream’s warm hands suddenly reached down and cradled Cross’s jaw, encouraging him to lift his still brightly flushed face. He did so reluctantly, whining softly as his gaze flickered nervously up to Dream.
“I’m so sorry, Cross,” Dream said softly, voice full of apologetic warmth.
He gently pet Cross’s ears and face before leaning in to press a kiss between Cross’s curiously cupped ears. What could Dream possibly need to apologize for? He wasn’t the one who’d… Dream kissed him again before pulling back so he could smile radiantly at Cross.
“I didn’t realize my dear sweet pup was in heat. But it seems Killer is taking really good care of you for me. Aren’t you Killer?”
Dream looked up to smile at the other dog who barked agreement and wagged his tail again. Cross groaned in Dream’s hands. Killer had shrunk enough that the movements pulled him partially from Cross. The release of pressure was both relieving and arousing. It left him sore but clenching at the tease of length still inside him as bright red cum began to leek from him which made him shiver all over again. He almost wished they didn’t have an audience to see his embarrassment. To see just how much Cross was enjoying this. Dream’s brightening gaze studying him and Nightmare’s thoughtful hum left him feeling hot, embarrassed, ashamed, and excited.
A dark tentacle curled it’s way around Dream’s shoulders and freed Cross from that wonderfully intense gaze.
“Why don’t we leave the dogs to play more while we spend some more…quality time together,” Nightmare suggested.
Dream hummed thoughtfully, glancing back down to Cross who whined.
“Would you like that pups?” he asked.
Killer’s answering barks was almost as enthusiastic as the twitch of his cock that Cross could feel against his folds. Cross shuttered with renewed arousal of his own just thinking about how good the last ‘play’ had been. He wanted to protest. Wanted to pull away from the tempting length still pulsing against him. Wanted to nuzzle into Dream’s arms where he could better hide all the sounds he was holding back as Killer humped experimentally against him making his eye lights blurry with arousal. Dream’s thumbs pet along the straps holding on Cross’s muzzle. Then Dream removed it and curled down to press a kiss to Cross’s mouth. Cross pressed desperately into the kiss, moaning low and begging. Dream smiled against him before pulling away.
“Good boy.”
Cross moaned again as Dream stood.
“You too Killer. Take good care of him for me, got that?”
Killer rumbled something that Cross didn’t really hear over the horribly wet sounds of Killer thrusting once again into his dripping cunt.
“Good. Have fun!”
Cross felt one more caress over his ears and then suddenly they were alone again in the little antechamber. Killer laughed and leaned in close.
“Gonna breed you real good, soldier bitch.”
Cross could only howl with pleasure as Killer began fucking him once again.