Undertale AUs Fluff/Lemons

Pet!Cross and Master!Nightmare

Nsfw warning.
Tentacle play, rough sex, Petplay, and slight Bondage.
I have made these two versions of Cross and Nightmare.
Cross is from X-Tale, which belongs to Jakei95(i believe) On tumblr. Or Jael.
Nightmare is from Dreamtale, by Jokublog on Tumblr.
PetCross and MasterNightmare belong to me.
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Nightmare hummed as he went down to his basement, where his favorite pass time laid in a large dog bed.

About a year ago, Nightmare had abducted Cross simply to have to himself. And since that year, Nightmare had trained his new pet to his every need and desire. To the point Cross would happily accept any chance to pleasure his Master.

Cross perked his head up, his lavender ecto ears lifting up as Cross' single pupil shined at the sight of his beloved Master. Since Cross accepted his role and obeyed, he had been treated much nicer and better then the first few months. Cross' tail swayed back and forth as Nightmare came closer, gently rubbing his Pet's ears. Earning a soft moan from Cross.

"M-master~" He panted as Nightmare continued to rub the sensitive ear, before stopping and going to the actual bed within the room.

"Come here, my Pet, It's time to play~" Is all Nightmare needed to say, before in a flash Cross was straddling Nightmare happily. Nightmare purred happily as he used his hands to trace around Cross' hips, he had taught Cross to always have his ears and tail, plus a feminine ecto body just for Nightmare.

"And maybe after playtime, we could go for a walk~" Nightmare offered, Cross nodded with excitment. Shuddering as he felt Nightmare rub his womanhood, slipping off Cross' short shorts.

"Heh, that's my obedient pet~" He whispered, before Nightmare's tentacles slipped off Cross' shirt and began to rub his tail and infest into his ribcage. Gripping his half soul.

Cross jolted and moaned out loudly, he looked at his Master lovingly, Cross placed his hands on Nightmare's shoulder as he was being pleasured.

Soon, he heard a small click, Nightmare had attached a leash to Cross' collar, Cross purred as he felt himself being laid down on the bed. Nightmare ontop, tugging at the leash softly now and then.

"Now, would you like it rough or gentle~?" Nightmare asked, before hearing a breathy response from the Pet underneath him.

"R-rough. . I love h-how you use me l-like I'm meant to be~" Cross panted, before crying out in pain as he felt a tentacle shove itself into Cross' womanhood.

"Good~" He heard Nightmare groan out, and the tentacle began to thrust roughly in and out of Cross, the rest of the tentacles set on holding Cross down.

"Heh. . So obedient, so helpless. . So Mine." Nightmare groaned, before leaning down and leaving bitemarks on Cross' collarbone and shoulder, where other earlier bruises and marks were left. Cross could gave swore he seen stars, it was all so amazing! Nightmare was everything to him, and having the chance to be pleasured was a gift from above!

"Aahh~! M-master! Mhh~!" He let his sounds flow, before his tongue lulled out and drooled as he panted. The pleasure was building up quickly, before he cried out in pure bliss and tensed up as he climaxed.

A chuckle was heard from Nightmare before he took out the tentacle, and replaced it with his cock, he smirked and began to ram himself in and out of Cross.

"I'm going to fill my Pet up, alright? Of course it's alright, it's not like you have a choice." He snickered, before his tentacles flipped Cross over so he was stomach down. Nightmare clawed at his Pet's back and pulled the leash back harshly.

Cross began to choke, having a lack of oxygeon, despite being a skeleton he needed to breath to a degree. Cross felt more drool drip out of his mouth, his body shaking from the large amount of pleasure it was receiving. He tried to paw helplessly at his collar, Cross' eyes rolled up into his skull a bit as he grew close again. Hacking and coughing as he tried to get back some air.

Nightmare chuckled, before leaning forward and turning Cross' head back for a kiss, Nightmare shoving his tongue into the other's mouth as he continued to ruthlessly pound in and out of Cross.

Both of their cries filled the sound-proof room as they both climaxed, Nightmare pulling out and releasing Cross. Who took a few minutes to regain himself.

Nightmare got up and sat on the edge of the bed as he waited for Cross to get ready.

"C'mon Pet, do you want a walk or not." He huffed, losing patience. Cross whimpered and sat up, putting on his clothes and nuzzling against Nightmare, holding the end of his leash to Nightmare.

"I-i wanna Walk. ." He said, and Nightmare nodded. He grabbed onto the leash and got up, Cross following soon after and walked beside him as they went up the stairs.

Cross had been on many walks before, so he knew exactly how to act. No talking to anyone, no interacting with anyone, and never allowing anyone else to touch him. And, if he need to talk to someone, all he could do is make cat sounds.

Cross purred and nuzzled against Nightmare, showing affection to the one who took such good care of him. People question Cross of why he was on a leash, and tried to tell him that he was reported as Missing.

But, he ignored them, or responded with a meow or a hiss. Nightmare often would scare them away, if not threaten to kill them. Soon, they both walked near a small food stand. Cross began to paw at Nightmare's side, meowing and whining to get his attention.

"Hm?" Nightmare turned to see what Cross was making a fuss about, he sighed. "This once, and then it's back to scraps and catfood." He said, and brought Cross to the small stand. Nightmare ordered sometype of Fish meal, and a small soda for himself.
They went to sit down and wait, people gave worried and odd glances at the 'couple'.

"Ignore them, Love, our food will be here soon." Nightmare let Cross give him affection. Eventually, Nightmare snuck a quick but loving kiss to Cross, wrapping an arm around his Pet's waist.

"Your my lovely Kitty, right?" Nightmare asked, as if he didnt know the answer. "Meow." Cross responded, and kissed Nightmares cheek and hugged him tightly. His tail swaying happily as he smiled.

The waitress came by with the food, once again, a worried glance at Cross. Who ignored her and looked at Nightmare and then at the food. Asking permission to eat.

"No, let me." Nightmare smiled, he didnt want Cross to ever become disobedient, and the best way is to nearly never give him a choice or independence.

Nightmare grabbed the fork and got some of the fish and wild rice, he held it to Cross' face, and Cross opened his mouth to eat it happily. This went on until the meal was gone, the entire two fish fallets, wild rice, potatoes, and corn. It was much better then any catfood or scraps, but, it was a treat. A rarity, so he savoured each and every bite.

"Let's head back now, my Pet." Nightmare purred, and let go of Cross' waist and set down the fork. Getting up with Cross at his side, holding Nightmare's soda.

Cross was occasionally allowed to take small sips, but it was enough to satisfy Cross.

Once they got home, Nightmare went to he couch, sitting with Cross on his lap. Cross was purring and nuzzling against Nightmare's chest, soon they both fell asleep.

What a perfect day, with the perfect Couple.