-underlust-

-lust sans's house-
-19.00 pm-
*Frisk P.O.V*

We're having dinner together as a family. Me with Sans, Asgore with Toriel, Undyne with Alphys, and Mettaton with Papyrus. The dinner is very nice... except for one thing.....

"Hnn~~" I tried to hold my moans. I looked at Sans face... he's looking at me with a devilish smirk.

Yep... you guessed it. Sans made me wear a tiny vibrator.. and now it's vibrating inside me.

"Frisk...?" Toriel called

I jumped a little, and look at Toriel

"Y-yes...?"

"Are you okay..? You blushing and sweating, are you sick?" Asked Toriel

"Yes Frisky~~, are you okay~~," Sans said, and he winked at me.

I gave him a glare.

He then smirked and suddenly the vibrator got faster.

"Ah_ hmph.." I closed my mouth just in time before my moans come out.

I forgot that he had the remote to the vibrator, so he can change the speed anytime he wants.

I excused myself and quickly ran to the bathroom.

"D-dam_ ahh~~ dammit, S-sans..." I tried to get it out with my fingers, but I can't the vibrator is too deep.

~meanwhile~
-Sans P.O.V-

'Hmm~~ she's taking so long, I guess I better give her a hand~~' I thought to myself.

"Guys, I'm going to check on Frisk," I said as I went to the bathroom.

I can hear some heavy breathing inside the bathroom. I knocked on the door.

"Frisk, are you okay in there~~? Do you need a hand~~" I smirked.

There's no answer from Frisk. So I simply teleport myself into the bathroom. And there I saw Frisk trying so hard to get the vibrator out by her self. She was sweating, pantsless, blushing and not to mention she was very wet. I smirked and come closer to her.

"Hey, baby~~~," I said. I think that startled her a bit, and she looked at me with those beautiful hearts shaped pupils.

"Do you need a hand~~?" I said with a flirty voice.

I came closer to her, and lick her neck giving her hickies. I can feel her body's heat, and that makes me feel lustier than ever. I touched her woman parts and start to tease it by rubbing it.

"Ah, ~~ahnnn..."

Her moans are so cute. I wasn't going to pull the vibrator out just yet. I turned the Vibrator to the max and thrusted my 2 fingers in and out of her.

"Ahhhhh Ahhh~~~ w-wa ahhhhh~~~ wait...."

"I'm not going to wait, babe~~~," I said.

I thrusted my fingers harder and faster, making her into a moaning mess.

"Ahh~~ ah ah ah~~ ahnn~~~"

'Damn, I want to make her scream my name so bad~~' I thought. Then I remembered that I have a box full of "stuff" that I haven't tried. I pulled out the tiny vibrator.

"Ah... ah... S-Sans... why are you looking at me like that..?"

My smirked gotten wider and teleported to my room.

"S-sans... w-what are we doing in your room....?"

"Babe~~ it's not over yet."

"Wha_,"

*click*

*Third person POV*

Sans handcuffed Frisk and ripped all of her clothes including her bra.

"S-sans..."

Then he pulled a box and inside it is full of sex toys. Frisk blushed

"We're going to have some fun tonight," He said while winking at her.

"And since the others are still downstairs, we should do something about your moans~~,"

Sans pulled a silicone ball gag from the box and put it in Frisk's mouth. But he's not done yet. He then pulled a big and long dildo. He shoved it into Frisk without any warnings.

"HNNN?!?!? Hnn~~~"

Sans started to thrust it in and out of her fast and hard. Frisk feels dizzy because of the pleasure.

"Hn~~ hnnnn hn~~hnnn~~,"

Sans was enjoying her moans but it's not enough for him. He wants Frisk to moan because of his dick, not from a tiny fake toy. (Yes, he was getting jealous of the dildo XD)

He's at his limit. He pulled the dildo out with force, pulled his pants down and shoved his big juicy dick inside Frisk.

"HNNNNN~~~~," Frisk screamed.

Not giving any time for Frisk to adjust, He thrusted in and out of frisk fast and hard.

"HNNN HNN~~~ HNNN." Frisk is getting so much pleasure from his huge dick rather than that tiny dildo.

The room is getting hotter every second, Sans took his jacket off and threw it away.

Sans want to hear Frisk's moans, while she screams his name, he doesn't care about the others anymore. So he took off the silicon ball out of Frisk's mouth.

"Now, scream my name baby girl~~." He said while thrusting faster

"Ahhh ah ah ahh~| S-San_,"

Sans thrusted his dick in her hard.

"You know that's not the name that I want to hear~~," Sans said.

He changed their position. So now frisk is on top of him. Sans look at her up and down, it was such a beautiful & sexy sight. Her hand are still cuffed, and it make her looks sexier then ever.

"P-pls ahh~~ s-stop..." Frisk said

"You really want me to stop~~? Okay" Sans said

Frisk was actually surprised by his answer because he usually won't let her go.

"But let's play a little game first~~~~~ if you can hold your sexy moans for 30 seconds, then I'll stop~~~"

Frisk nods in agreement.

Sans smirked while watching Frisk trying to hold her moans. Frisk bounce up and down on his dick. Frisk was having a hard time to hold in her moans.

27 seconds have passed, and Frisk still hasn't moan yet. '3 m-more hnn... seconds..' Frisk thought to herself.

But sans has another idea. He grabbed Frisk's hips and pull her down, and his dick hits he G spot.

"AHHHHHH~~~~~~." Frisk screamed

"Ups... you moaned~~~," Sans said smirking.

He proceeds to hit her G spot making Frisk overwhelm with all of the pleasures.

"Scream my name, baby girl~~," Sans said while licking his teeth.

"D-Daddy~~~~ Ah~~~ ahhh ahh~~~,"

"Louder"

"DADDY AH~~ AHHH~~~"

"I said LOUDER"

"DADDY AHHH~~~~ AHH PLS FUCK ME DADDY~~~~~~."

Hearing that, sans reached his limit.

"This is for ah.. y-you baby girl"

They cummed together.

"Ahh~~ sans you cum... is too much~~~~~"

Sans is still cumming inside Frisk. And when he finished, he pulled his dick out and some of his cum is dripping from Frisk's womanhood.

They look at each other with love. Sans cupped her cheeks and they kissed passionately.

Frisk looked down at his crotch and saw his dick is still hard. And she knew that it's going to be a long night for her.
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Hope y'all like it, y'all dirty sinners