Somehow, the two were able to climb up the stairs to Sans' bedroom making out the whole time. Big sloppy kisses and love bites already began to cover them. Sans paused the kissing for the moment, closing his bedroom door and locking it tight. If Papyrus ruined this moment for him, Sans would never forgive him.

Once everything was secure, Nagito resumed kissing Sans, licking the sides of his skull. He paused, nibbling on his vertebrae, mumbling sweet words. "You're so beautiful Sans" and "God, you're just so perfect!"

Sans pushed Nagito down on the bed, climbing his lanky body. This is going to happen. This IS going to happen. Sans stared into Nagito's eyes. Pools of grey diamonds shone back at him. No longer did his eyes portray sadness.

Only love, with hints of lust.

Suddenly the front door opened and shut. Papyrus was home.

"Goddamnit!" Sans hissed, glaring through his door.

Papyrus was now singing 'Big Iron' by Marty Robbins in the living room. Goddamn Fallout: New Vegas and its catchy western soundtrack.

Nagito pulled the collar of Sans' shirt, luring his face closer to his own. "We could always play music of our own," He suggested, kissing Sans' left temple gingerly.

The skeleton shrugged. "What kind of music?"

"Oh you know…"

"Kanye West?" Sans rolled his eyes.

Nagito didn't reply. He only smirked mischievously at the skeleton. The human pulled his iPhone 6S, swiping it to reach the Spotify app. He pressed shuffle, and Kanye West's song, 'Good Morning' began to play – loud enough to suppress the screaming of Papyrus.

Sans was able to recognize this song, as he had been listening to 'Graduation' per Nagito's request.

"What're you thinking about, Silly?" Nagito murmured, luring Sans back to reality once more.

"How great you look underneath me," Sans teased back, leaning to kiss his lips. A surge of confidence erupted through the skeleton. Despite being the shy one, Sans was turning out to be the more dominant than he expected. "I'd like to see what underneath all those clothes, pet."

Nagito blushed, biting his lower lip. Sans' low, husky voice sent chills through his bones. "A-as you wish…" He mumbled, obediently. Pulling down his pants, he stared into the eyes of the skeleton. Two, white snowflakes stared back. A small, red flush crept across the skeleton's face and Sans had to look away for a moment.

The human was now only in his plaid boxers, a bulge pushing against the fabric. Nagito bit his lower lip harder. He was now fully exposed for Sans.

"OWO, what's this?" Sans pressed a finger on the bulge.

"Eeeyyaaahhhhh~!" Nagito cried like an anime girl, his penis twitching at the touch of boney fingers.

"Shush! I don't want my brother to hear you!" Sans covered Nagito's mouth to prevent him from moaning. Nagito nodded, embarrassed at how he melted in Sans' arms.

They paused for a moment, listening for Papyrus' voice over Kanye's.

Papyrus was still singing along to Big Iron, complete oblivious to the love making above. Phew.

Sans moved his hands away from Nagito's mouth and back to his boxers. He stroked his pressed bulge. Already there was a wet spot where the tip of his penis was dripping. Nagito panted hard. Gripping the sheets, he moaned through clenched teeth.

"What do you want me to do, pet?" Sans asked, teasing the now trembling human.

"I…," Nagito stammered out. "I…I don't know if you'll like it.."

"What is it, Nagito?" Sans tried to hid the concern in his voice. Oh god, Nagito was probably into weird shit. There had to be something completely wrong with Nagito. Of course.

"I…want you to put your fingers in my ass…" Nagito covered his face, flustered with even more embarrassment. How could he admit something so lewd in front of Sans?

Oh thank God. Nagito isn't a furry or some other shit. If he was a furry, - I'm out. Sans let out an internal sigh of a relief. Then another issue arose. Sans didn't have any lube lying around. It had been awhile since Sans had sex, let alone go on dates.

He put two fingers in his mouth, salivating them. With his other hand, Sans pulled down Nagito's plaid boxers.

There it was. Nagito's ethereal, magnum dong. Shining in the low light of Sans' bedroom. Sans didn't expect Nagito to be…this big…

"Are…are you ready?" Sans breathed out, fingers glistening. He kept staring at Nagito's magnum dong in disbelief.

"I'm ready if you are." Nagito replied, spreading out his legs.

Sans gently shoved his fingers in Nagito's butthole. The human gasped out, shuddering at the touch. Sans hit the right spot.

Suddenly, Asgore's theme song from Undertale began to play. Nagito couldn't help but let out a laugh. "What can I say? The soundtrack for the game is pretty good."

Sans jerked his fingers back in forth, rubbing Nagito's sweet spot. The human cried out, gritting his teeth harder. It was difficult to be quiet, the sweet pleasure consuming his whole body.

"Fingers in his ass, fingers in his ass." Sans began to say, singing along with the theme song. "Kanye West he likes, big fingers in his ass."

Nagito was about to ask why Sans was saying that about Kanye, but was too preoccupied by the fingers in his ass. He let out another moan, pulling the sheets of the bed all around him.

"Fingers in his ass, fingers in his ass. Kanye West he like BIG fingers in his ass." Sans panted, his movements matching the beat of the song. His fingers coiled in and out much faster, driving Nagito insane.

"Sans…I'm going to…"

"NAGITO HE LIKES, MY FINGERS IN HIS ASS." Sans bellowed out.

Meanwhile below, in the living room, Papyrus was in the middle of making a plateful of pasta. He thought he heard something upstairs, but shook it off. It was probably the mice again.

Nagito cried out, coming a thick load out of his magnum dong.

"Fingers in his ass…"

"Fingers in your ass." Sans corrected, leaning down to give Nagito a soft peck on the lips.