I hate myself which is why I'm posting this story now and not waiting until I've completed my two remaining dissertations.
This story is entirely dedicated to nagisaheichou for being a great person and a fantastic source of inspiration.
Fair warning to all fontcest shippers here for the fontcest: papyton shippers are going to have a better time than you.
That's all I'm saying to avoid spoilers.
Now, ENJOY!
Papyrus was happy.
He had a nice job as a sentry in Snowdin. He strived for a promotion to become a Royal Guard but never quite passed the assessment exams Undyne gave him thus far. That being said, he never let it deter him. Every test he failed helped him improve and better himself for the next one. He was going to keep working hard and diligently. Eventually, and he was certain of it, he would pass one of the exams and achieve his dream job. Maybe Undyne would even make him her lieutenant one day. But now he was getting ahead of himself.
Papyrus was happy.
He lived in a nice house with a great big brother. Sure, Sans was lazy; he slept almost all the time, slacked off, and ditched work more times than not, but he had a golden heart. He was dedicated and passionate even if he tried hiding it beneath an apathetic façade. He was also kind of funny, but Papyrus would never explicitly admit to it. Sans was imperfect – perfectly imperfect, just the way Papyrus liked him. Though it would still be nice if he actually picked up his socks once in a while.
Papyrus was happy.
In addition to have a nice job, a nice house, and a great big brother, Papyrus also had a fantastic boyfriend. Mettaton was caring, loving and generous. He showered Papyrus with everything he remotely desired – even if it was just a fleeting interest. He had too much money to manage and so he didn't mind carelessly throwing it around. This consequently meant that their nice house suddenly became a luxurious house filled with the most stylish furniture and expensive electronic entertainment sets. Recently, they had even expanded it to enlarge Papyrus's already spacious room to accommodate Mettaton. The latter had actually suggested he move out of Snowdin and into one of the apartments of the hotel he had bought, but Papyrus liked living with Sans and so this became the resulting compromise. And it was perfect.
Papyrus was happy.
He now lived in a luxurious house with nearly all the monsters he cared most about. The last thing that he needed to be as happy as possible was for Undyne to move in with them; but that was impossible. She didn't like Mettaton and couldn't stand Sans's horrible jokes. Frankly, neither could Mettaton which was source for a lot of conflict in the home, but it wasn't so bad. Despite all their yelling and arguing, Papyrus was sure that underneath everything Sans and Mettaton were great friends who simply enjoyed bickering.
"you seem happy." Sans commented, side-glancing at his taller brother.
They were both sat on the sofa, waiting for Mettaton to return from their expanded kitchen with a bowl of popcorn. Papyrus was excited to have a wonderful movie night with two monsters he absolutely adored and couldn't imagine his life without.
"I am." Papyrus confirmed giddily. "I don't think I've ever been happier than I am now."
Sans smirked and glanced away, staring at the DVD menu on the TV screen. "i'm glad."
"To think this all started because Mettaton asked you to perform at his restaurant." He sighed, remembering the moment fondly. When one of the famous robot's performers had cancelled at the last second, he had reached out to Sans after hearing from other monsters how brilliant of a comedian he truly was. He performed, he invited Papyrus to tag along and later introduced him to Mettaton, and then the rest was history.
"yeah, who knew i'd be living with one of my bosses one day." Sans commented mostly to himself.
"Life is strange." Papyrus chuckled. "But I'm so thankful things turned out this way."
Sans smiled, staring off into the distance. "yeah."
"Alright, boys!" Mettaton shouted as he returned from the kitchen with a big bowl of popcorn, "Enough chitchat! It's time we watch a movie!"
Sans rolled his eyes and Papyrus laughed. The robot plopped onto the sofa, sitting in between the brothers and threw an arm around Papyrus. He pulled the skeleton close to his body and allowed him to lean his head on his shoulder while he reached for the remote. Sans curled into a ball, tucking his knees close to his chest as Mettaton shuffled through the DVD's menu options. He seemed almost disinterested, but then again he always looked that way.
"Darn! I thought Alphys said this movie was in English!" Mettaton complained, "There are only English subtitles!"
"like you were actually going to watch it." Sans snorted sarcastically.
"You're right." Mettaton conceded bluntly, "We were probably just going to make out the whole time just like we are now."
He then turned to Papyrus and planted a kiss on his forehead, quickly peppering him with more pecs when he began laughing and flailing. The bowl of popcorn toppled out of Mettaton's lap but Sans managed to catch it before it spilled. He held it for a moment before he finally rose from his seat and placed it where he had been sitting.
"Wait, Sans—" Papyrus called as he wrestled Mettaton's face away from his long enough to speak.
"don't let me stop you, bro." He joked as he headed towards the stairs.
Papyrus wanted to beckon him back, but Mettaton suddenly managed to slip past him and resumed his attack. He kissed his forehead and cheeks, moving to tickle his neck. The taller skeleton was thus too distracted to ask for Sans to return and eventually conceded to his boyfriend's affection. He decided to fight back with his own flurry of kisses. They quickly found themselves in a tangled mess of limbs. Fun and games were soon set aside when Mettaton pressed his metallic lips against Papyrus's collarbone, earning a surprised moan in response.
"M-Mettaton!" Papyrus gasped in an agitated whisper.
"What?" The robot responded innocently as his fingers moved to trace the other's ribs sensually.
"We can't…" Papyrus blushed, "Not here…"
"Why not?" Mettaton challenged.
"Because Sans sits on this couch too!" He argued, all the more embarrassed.
"We can just put something beneath us to avoid a mess." Mettaton offered and kissed at Papyrus's neck when he saw his shocked expression, "Besides," he added, "If we go back to our room, Sans will definitely hear us. He's in his room, you know…"
Papyrus covered his face in embarrassment. They were supposed to watch a movie and have a nice bonding time – but the taller skeleton would be a liar if he said he didn't find the idea of sex currently more appealing. "What if…" Papyrus started quietly, "What if Sans comes out of his room? He'll see…"
"He's probably already sleeping, Papyrus." Mettaton pointed out, "You know how he is."
"True…" Papyrus reckoned.
"We'll be quiet." Mettaton added, "We can even turn on the movie so the sound will muffle whatever noise we make…you make." Papyrus blushed all the more and frowned at the robot who simply laughed. "Don't look at me like that! You're the one who's loud! It's not my fault!"
"Yes it is…" Papyrus countered, "You know how to make me feel good…"
Now it was Mettaton's turn to blush. Papyrus didn't understand how it was physically possible given he was made of metal, but it was endearing all the same. "If there was a chance that we postpone this, it's totally gone now." He claimed.
"Agreed." Papyrus seconded with a soft giggle. He already felt something stir in between his legs which simply made him all the more eager to get intimate.
Mettaton leaned in, pausing when his lips were inches away from Papyrus's mouth. "I love you." he whispered.
"I love you too." Papyrus replied, closing the remaining gap between them.
The kiss was slow and sweet, steadily building to something a bit naughtier, but Papyrus didn't mind. It was what he wanted. It was what Mettaton wanted. How he loved that famous monster. Time and time again, the skeleton couldn't quite believe his affection was truly reciprocated but tender moments like these casted his doubts aside. Mettaton loved him and he loved Mettaton and he wouldn't have it any other way. He couldn't imagine it any other way.
Papyrus was happy.
But Sans wasn't.
And he was glad his brother never came into his room anymore under the pretext that it was far too filthy for his tastes. It kept Papyrus from finding the many empty bottles of alcohol scattered across his floor. Sans emptied another one as he leaned against his door, listening to his brother and Mettaton's moaned I love yous barely muffled beneath the sound of some random human movie. He swallowed the burning liquid with big gulps, allowing his mind to wander to a bygone time only he remembered wherein Papyrus said "I love you" to him and not Mettaton.
Papyrus was happy.
Sans was miserable.
I can't guarantee when this story will update but it won't be frequently or regularly.