You navigated the car through the dark nighttime streets, until you spotted the sleek white surface of the Lab. There was a huge celebrity party that night, and Mettaton had called you up and invited you as his plus one. You were unsure of why the star of the underground would want you, an ordinary human, to join him to a high-end party, but you didn't complain. Free food, amiright?

Mettaton, unfortunately, could not pick you up, so you were going to Alphys' lab, which was his current residence. Despite being an A-List celebrity, he still stayed with his little dino-mom. You guessed it was cheaper.

You knocked upon the sleek white door, but nobody answered. You tried again, banging louder. Sure, you were early, but only by 10 minutes or so. You pushed the door slightly and it swung open. Looks like Alphys left it unlocked.

You let it slam behind you as you called out, "Mettaton? I'm here!"

He didn't respond, so you tried again, "Mettaton! Get your ass down here before I refuse to go to this party at all!"

Nope, not a sound in response. You were about to walk out the door when you thought that maybe he was charging and didn't hear you. You stomped your way up the stairs, totally ignoring the fact that going to his room might be overstepping your boundaries as a guest.

The upstairs hallway was long, and had numerous doors along the way.

"Mettaton EX, I swear that if you don't come over here right now I will not go to this party with you!"

You waited, counting to yourself and walking down the hall.

One Mississippi, two Mississippi, three Mississippi, four Mississippi.

He still wasn't coming. Only six seconds left for him.

Five Mississippi, six Mississippi.

You stopped outside of a door with pink beads hanging from the doorframe.

Seven Mississippi, eight Mississippi, nine Mississippi.

"OH YEEEESSSSS!"

Maybe that was him powering up? You pushed open the door, and your jaw dropped at the sight in front of you.

Mettaton lay on his black bed, his head thrown back in pleasure and his mouth open, making some rather obscene sounds. His left hand was pressed against his face while his right-

Ohohoho, his right hand. It was holding the pink SOUL that was usually proudly displayed to the world in his abdomen. Right now, though, he had two fingers shoved into it, pumping in and out rhythmically. It was producing some artificial gooey substance that covered most of his hand and torso.

Your astonished face slowly melted into a coy smirk. You walked into the room and pulled the door shut behind you.

"So that's why you made that face when I shot at it," you remarked loudly, "I was just stimulating your very big g-spot, wasn't I?"

The robot stopped his dirty actions and sat up, looking you in the face, startled.

"Oh, my darling, I apologize, I had an issue and needed to, er, relieve myself. I'll just go and get cleaned up so we can forget about this and head to that party," he told you.

"Why exactly did you need to relieve that 'issue', Mettaton?" you asked him, slowly walking to the bed. He blushed and replied:

"At the thought of you in that dress, I couldn't resist." He began to move to stand and go clean himself.

With three large strides and a hop you were on the bed and stopping him. After seeing him like that, you couldn't resist either.

"Mettaton, we're not going to that party," you told him, straddling his waist.

He looked at you, "I beg your pardon, my darling?"

You went on, "And, I won't go out anywhere
with you again."

You laughed at his confused expression, "You didn't come when I wanted you to, so I refuse. Never again."

"My darling, how do I make it up to you?"

You leaned down and whispered, "You have to cum when I ask." (Okay, "cum" was the 666th word, ummmm)

He gulped and you noticed something in his eyes.

"Oh, it's your first time, isn't it?" You were worried for a moment. Could you really be Mettaton's first? Did he want you?

"My darling, I wouldn't want anyone else to take my virginity," he told you.

"Alright then," you smiled, leaning down onto him and kissing him full on the mouth. His hands reached up and grabbed your waist tightly. You pulled away from his delicious lips in order to move away.

"This is an issue," you remarked, "Well then, we will have to improvise."

"Improvise what?" He asked, concerned.

"Mettaton, how much do you trust me?" you asked him.

"With my life," he responded.

"Good. I'll take care of you, don't be scared."

You stripped yourself of your stockings and twisted them, using the fabric to tie his hands to the bedpost. You also grabbed a sleeping mask that was conveniently placed on his nightstand. You slipped it over his eyes and pecked him on the lips, resuming your seat on his crotch.

"My darling, are you sure about this?"

You weighed your options, and decided on honesty.

"Well, I have had sex before, and I've been tied up before, but I've never actually gotten a chance to tie someone up. Also, stop saying 'my'."

"Why?" the fact that he was completely vulnerable under you made your cunt ache and throb.

"Because tonight, you are my bitch."

He gulped and nodded, and you kissed him again, slowly and sensually. It grew more heated however, and your tongues were soon battling. You won and pushed your tongue into his mouth, exploring your new territory. His hands struggled against the flimsy restraint, but you grabbed his arms and forcefully shoved them against the headboard. He got the message and gave in to the helplessness.

You pulled your lips away from his, kissing instead his jaw and neck. You noticed that he was biting his lip in an attempt to restrain a moan.

"Let me hear you," you told him, moving back up to suck on his bottom lip.

He groaned out quietly in pleasure, and you smile against his mouth. It's weird that he seems so innocent, it's weird that he is listening to you. What happened to the oh so glamorous Mettaton? The one that stood confidently on stage posing and giving his audience numerous heart attacks from that alone?

Here he was, under you, trying to hide his moans.

God, you loved him.

But now wasn't the time for profound observations. You were supposed to be fucking a robot here.

You pick up his right hand and lick off the goo from his earlier masturbating session. It tastes sweet and good and you want more. It's just like candy.

You grab his heart, suspended in the clear liquid within the open glass case. You waste no time, diving in and sticking your tongue through the membrane. Mettaton gasps, clearly not expecting the penetration of what seems to be his most sensitive part. You flick it in and out, and he shakes and moans under you. And you're just getting started.

How the hell is he going to keep from cumming?

You push that to the back of your mind for now. At the moment, you just want to feel him squirming in pleasure.

You continue to use your tongue, but also slip in a couple fingers. He's having a hard time containing himself. His back raises up and he pulls in his legs, his moans dissipating to static. You can tell he's been worked up to the edge, but you stop and drop the heart back where it belongs, shutting the door of the glass case.

"Mettaton," you begin to ask, "Do you have any, you know- nether parts?"

If that isn't the most awkward question you ever had to ask, you don't know what is.

"I can have whatever you like," he tells you, "Give me your hand."

"Don't get too bossy now, remember who's i charge here," you chastise, but comply anyway.

He slides your hand down his chest until you reach a small lip and press down. It swings open to reveal a switch with four settings. At the moment, it was at the "none" setting

"Mettaton, do you have any toys?" you asked him, eyeing up the options before you.

"I did find a few in the lab, and Dr. Alphys gave them to me. I haven't used any yet. They're under my bed," he said.

You smirked and decisively chose one. You slide off him to observe a panel that has opened, revealing his core. You are fascinated. You stick in your fingers and rapidly finger him. His back arcs again and he mewls loudly.

"Don't you dare orgasm," you tell him, leaning down to lick his clit. He gasps and nods fervently. You're certain that if his arms were 't restrained he would be shredding the sheets right now. You have mercy and remove the blindfold just before shedding your skin tight dress.

His eyes widen, and you think he drools a little. He appears to be utterly fixated with your covered breasts, so you discard not only your bra but your lacy black panties as well.

Crawling over him, you kneel above his mouth, simply giving him an order to eat you out. It's hard to believe that this is his first time, as he skillfully licks and nibbles while you sit on his face. You can't help but purr and whine at his actions, using all your restraint to keep from begging him for more. You are in charge tonight.

Instead, you grind into his face and grab fistfuls of his silky black hair. You feel a tightening knot in your stomach and moan loudly as he sticks his nimble tongue into your hole. You release your juices onto him with a loud, " Ah!"

"You'd better swallow that," you tell him, still trying to be the one in charge. He gulps down your milky white fluids and licks your pussy clean.

"Good job," you purr appreciatively, getting off the bed and rummaging underneath. You find what you want and sit on the bed again, observing his dripping vagina. It's inviting you in, completely wet and gaping and ready for you.

You take one end of the double dildo in your hand and lower your womanhood onto it. You position the other end at his entrance, hesitating a moment.

"Don't cum until I tell you, Mettaton," you remind him again. He nods, obviously scared.

But then you grip his hips and thrust into him with all your might and he screams in pleasure, his back arching inhumanely high. You pound into him, each thrust shoving the other end into your g-spot. You were sure the volume of your moans and Mettaton's was loud enough to be heard all down the block.

"Fuck," you murmur as you feel your second climax coming near, "Mettaton, when you reach it, don't hold a fucking thing back."

You can't tell if he hears, because he's still screaming out moans of pleasure. He wraps his legs around your waist and cries out.

Finally, your thrusts become sloppy, and Mettaton shouts out, "Shit, darling! I'm, I'm CUMMING!!!"

You hit your climax just as he does, moaning out, "METTATON!" and panting heavily.

After a few moments' rest, you remove the dildo and untie the restraints on his arms.

He pulls you into him, and you protest, complaining that he's hot and the sheets are covered in cum and you're both covered in cum and you need to clean. He relents, and carries you to a bathroom where you shower as he sits outside the door. When you're done, he carries you to a guest room.

He lets you curl up into him on the bed as you drift to sleep, mumbling that that had been way more entertaining than the party.