Undertale Smut

Mettaton x female reader

The "glorious" monster was in heat,trapping himself in his room.Despite his hungryness,need of the restroom,and other things he stayed put in his room.Even Alphyd was starting to get worried.
"M-Mettaton are y-you alright?"
"Um yes Alphys,be a darling and bring me some food?"
"O-okay Mettaton b-but then I h-have to leave."
"Mhm.Okay.Got it."

Alphys went and got Mettaton some food and slipped in his room.As she was about to leave Y/n walked in.

"H-hi Y/n,gotta go!Feel free to explore the lab!"She said

Confused,Y/n went and explored.She came across Mettaton's room and stopped hearing the weird noises.She leaned her head on the door,listening.She quickly backed away slightly blushing when she heard moans coming from the other side.As she was backing away the door opened.

"Who?!Who is it?Alphys...is that you?!Y-y/n?W-why are you here darling?"

"J-just exploring"

"Hmm okay.."

You seemed supprised he wasn't mad and was letting you go like that.You stood up.

"Y/n now....don't leave...naughty girls must have punishment..."He whispers in your ear

You quickly try and escape but before you could do that he had already grabbed you.He picks you up and carries you to his room and laying you down on the bed.He pins your arms upwards and ties them to the bed with some rope.He quickly turns toward you.

"Since perhaps you were "just exploring" but made the wrong choice,I'll let you choose were I start for your punishment."He says smiling innocently

"Hmm?What was that darling?Tits?My pleasure."

You try and kick him away as he unbuttons your shirt and unclasps your bra.He gently touches your tits before leaning over and licking one while massaging the other.Over time you stop,calming your guard and he realizes this.You still resist moaning though.

"Come on Y/n...I know you want to moan..."

He slips a hand further down into your underwear and gently rubs along your clit.You tense up a little as you feel his hand are cold.

"Still not working?Hmm...thought it would for sure.."

He rubs more intensely before entering a finger inside you.He slowly starts pumping his finger in and out of you.On accident,you let out a small moan.He hears this and quickens his pace.Finally after a few minutes of this he stops and pulls your underwear down.

"Y/n darling,listen I want you to know I'm not small,this will hurt quite a bit I'm afraid but it's ok."He says smirking

He quickly drops his leggings and walks over to you.He gently pushes into you and starts thrusting at a slow pace.He realizes your pain and kisses it away.After a while the pain stops and he starts thrusting again this time faster.

Having never felt pleasure you moan quite a lot and he realizes this.

"Why darling aren't you just a moaning mess!"He says picking up his pace

He leans over to your ear:
"I want you to scream my name,understand darling?"

You kind your head and feel him going even faster the pleasure unbearable.Feeling you about to cum he smirks.

"Whats my name?"

"M-mettaton!"

"What?"

"Mettaton!"

"I can't hear you!"

"METTATON!"You scream as you cum

"Good girl."He says getting up and putting back on his clothes.He unites you and you do the same.As you leave you see a very stern looking Alphys.
"A-Alphys I-I thought you were g-gone."

"I came back to get my phone."she says coldly

"I heard all of it."she says walking to Mettatons room.

She didn't stutter once.You're in big trouble.