"A-ahhh~ B-brother please! This is… s-so… AHH~ Wrong~"

Sans looked up from his positioning to his brother who was biting his hand and blushing way too hard. "What's wrong with it, Papy? Just throwing you a bone, that's all." He chuckled at his little pun.

"SANS! Now isn't a time for your vexatious jokes! I'm seri—agh~" In the time it took Papyrus to get Sans' attention, the latter skeleton had already gotten bored and went back downstairs to the "party." His tongue lapped at the orange liquid that had fallen after the previous "accidental" orgasm.

He pushed Sans' head away, causing him to whine. "What's the matter, Pap?"

"I… I don't think we should continue… It's not right. We're brothers, Sans. Not lovers. I…"

"No. You're right Papyrus. But… I…" He shifted from his spot to meet his brother face to face. His voice dropped to a mere whisper. "I love you… more than just a brother… And when I told you that I loved you, you said you feel the same and when I kissed you, you didn't stop me and I teleported us here and you didn't stop me and—"

"Sans… calm down… It's okay to like me like that, I guess… We can continue if you'd like." Orange magic lightly drifted to the ceiling as he saw his brother nod slowly.

"I'd like that," the older skeleton said as blue magic also drifted out of his left eye socket. He leaned in so that they were only centimetres apart.

"I guess… I guess I love you too…" Papyrus suggested as he clanked his head with Sans' in what was considered a kiss.

Sans let out a small chuckled and smiled brighter. Summoning an ecto-tongue, he pleaded for entrance. He was warmly welcomed by the opposing tongue. Sans deliquesced into Papyrus' mouth as he became a moaning mess.

"Hnnng~ Papy~" Phalanges snaked down Papyrus' ribcage and near his entrance. He brought his hand back up to the ribs to tease them.

"Mmm… Sa-AHHH-nsss…" He couldn't help but feel that it was still wrong.

"Oh, Papy~" Sans moaned as he left upstairs to return to the "party" once again. One kiss after the other he got to the pelvis bone which was bare. "Papy? Is your magic off or something? There's no… there's no, uh… thing… there."

"I'm sorry, Sans. I just… It doesn't feel right anymore. Maybe we should just go back to bed. I'm not really in the mood anymore." Papyrus pulled the blankets back over him, trapping Sans in the process.

Sans grunted and got out from underneath the blankets, sitting promptly on his kneecaps. "Fine," he muttered to his self. He crawled into bed and waited for the sound of Papyrus' snoring.

Quietly, he got out of bed and took the sheets off of Pap's lower half.

"Nyeh… Mettaton~" Papyrus said as he turned onto his side.

"Damn it, Sans, think. Papyrus can't see me doing this… He'll never forgive me… I'll never forgive myself." He looked around the room for a blindfold. His eyes fell upon one of Pap's scarfs. "Perfect."

He looked at Papyrus. He didn't want to wake him up so he used his magic to pick the scarf up, lift Pap's head, tie it, and put it back down peacefully. Papyrus never even stirred.

"Good," he whispered, feeling somewhat proud of what he just did. He conjured up more magic to get another scarf and proceeded to tie up Pap's hands. "I'm sorry for this. I can't have you attacking me."

"Nyeh… M-Mettaton?" He turned onto his back again.

"Thanks, Papy," Sans whispered. He quietly began leaving trails of kisses down Papyrus' spine. His bony hands traced along Pap's ribs.

"Hnnnng~ Mettaton~"

Sans ignored him and continued. A hand traced along the spine and down to the pelvic bone where there was nothing. It rubbed in circles, first small, then larger until his whole hand was groping it.

The hand upstairs slithered down to the inner thigh bones were it went up and down, up and down.

"Ohhh! M-More, Met-Mettaton~"

"I see how it is, Pap. Thinking I'm Mettaton…" He scoffed at the thought but still continued to work at his business.

With both hands now tracing Pap's inner thigh bones, Sans wriggled down the sheets so that he could see Papyrus' pelvic bone himself. There was still nothing there. But that could easily be fixed. He stuck out his tongue, short and flat, and started to trace along it in a circular motion.

"METTATON!" Papyrus jolted up, scaring Sans half to death. "What's going on?"

Oh shit. Oh shit. Oh shit. Oh shit. Oh shit. What do I do? "Um… Just calm down, dearie. I'll give you a good time…" Sans said in his best Mettaton voice.

Papyrus, not even noticing that there was something wrong with 'Mettaton's' voice just sat there dumbly. "Is the blindfold and hand-tying necessary?"

"Very much, dearie. It makes things more… interesting… to say the least."

"Oh alright. Just be gentle."

Finally, Sans thought as he saw the orange ecto-vag appear. He removed his hands from the thighs and carefully outlined the clit. It started to throb, begging for more attention. Very lightly, he teased it by going in small circles around it.

"Please~ M-more~" Papyrus begged.

Sans smiled, even though he knew Pap couldn't see him, and began to rub a little faster and a bit harder. Going from there, he only continued to pick up the pace, rubbing faster and faster until finally—

"AAAAHHHHHH!" Papyrus moaned as he came onto the bed, panting heavily and orange cum leaking out at a steady pace. Sans quickly got to work and licked it up. As soon as he was done licking up Papyrus' cum, he started to silently take off his shorts.

"I'm gonna put it in, dearie. Okay?" Sans asked, now in a seductive Mettaton voice.

"P-please…" he whimpered, almost as if he was… lusting…?

Whatever you say, Pap. Sans slowly put his erect blue member in. A bit tight, but otherwise okay. He kept sliding in until it swallowed the whole thing. Slowly pulling out, he thrusted back in, maybe a bit too hard for the other skeleton.

"AHHH!" he screamed/moaned at the same time. Sans scrunched his face.

Whoops… Nevertheless, he continued in the rhythm of pulling out and going back in. Papyrus just laid there and took it, moaning Mettaton's name instead of Sans'. He could feel his self getting close to climax so he sped up the pace and hoped that Pap was close too. Thrust after thrust, Sans kept getting faster and faster.

"I'm s-so close…" he said quietly, trying not to give it away that he wasn't Mettaton after all.

Faint footsteps could be heard in the hall.

What the hell is going on in there? She thought to herself as she heard the moaning. She decided to step in. Opening the door, oblivious to what the two skeletons were doing she said: "Papyrus you're late for your… training…" She stared at them, finally realizing what was going on.

Sans gave one more thrust before they both came and finally realized that Undyne was right there.

"Holy shit," Sans whispered as he shook his head and symbolled for her to be quiet.

"What's going on here?" she asked, extremely confused.

"UNDYNE?! Oh no… I'll never get into the Royal Guard now…" Papyrus brought his tied up hands to his skull and cried.

Sans poofed away his ecto-dick and got off of Papyrus. "Sorry, Pap," he said in his normal voice.

"Sans? Undyne? What the hell is going on here?"

Undyne and Sans both looked at each other, shocked that they had just heard Papyrus curse for the first time.

"I…" Sans began, not really sure what to say at that point. "I lied. I'm sorry, Papyrus. I just… I love you."

"Sans," Papyrus began to say. He stopped his self. "I love you too, brother," he finally said.

"You're still late for your training," Undyne mentioned again.

"I'll be there in a minute. Brother, untie me please. We have a lot to talk about once I get back."

Sans obeyed and untied his brother. Looking each other both in the eye socket, Papyrus could see all the sorrow in Sans' sockets. He was deeply and truly sorry for once in his life. Papyrus couldn't be angry at that face…

"Brother. Come closer."

Sans leaned in closer. Papyrus took his gloved hand and put it on the back of Sans' head while he pulled him in for a sweet clank on the teeth. Almost as if on cue, the shorter skeleton summoned an ecto-tongue. The second Papyrus let him enter, he bit the other's tongue, resulting in a scream and a glowing eye of anger.

"What the hell?" he muttered to himself more than Papyrus.

"Don't EVER do that again," he stated as he left the room, passing Undyne's shocked face in the process.

The second Sans tasted magic/blood, he knew things would just get more interesting over the week.