3 years have passed, Frisk went to university and then became a doctor, Sans helped her in anyway he could, he became a good scientist, but now Frisk discovered something...

Frisk's POV

Those three years were the happiest of my entire life, me and Sans found jobs for both of us...well, apart from us, Papyrus and Mettaton got married, even Alphys and Undyne! I got to see Mom, Dad and my dearest Chara and Asriel, and I'm really happy about that! Now I'm at hospital, I'm working, I really love my job, it's tiring me out sometimes, but I keep holding on...Gaster even gave me some hints to work, in case I would meet something strange in a patient...then I felt strange...I had to go the bathroom

Frisk: Myral, I'm going one moment to the bathroom

Myral is my assistant, she's very kind, and I trust her

Myral: Sure doctor

I quickly ran in the bathroom, and then I throw up everything I ate this morning for breakfast...weird, maybe I got near some virus and I got sick, well, that happened too when I was seven years old...Sans would tell me that I have to stay at home, and he would take care of me with medicine, tickling and watching films in the night with a mug of hot chocolate until I wouldn't fell asleep...well, I think I should rest at home, but first, I have to tell Myral that I'm going home...I returned in my office and found her writing on her computer

Frisk: Myral...

Myral: Umm, Mrs? Are you ok? You look like you're going to faint...

Frisk: Indeed...I think I got sick, I'm calling my husband to ask him to take me home, will you please take my place for visiting?

Myral: Sure Mrs.

I called Sans, and he responded immediately

Sans: Frisk? Are you ok?

Frisk: No Sans, I think I got sick, some minutes ago I even throwed up my breakfast...

Sans: Don't move, I'm coming!

I closed the call and sat down on my chair in front of my desk...I only have to wait for Sans

Myral: Mrs, can I ask you something?

Frisk: Go on...

Myral: Your husband is a monster right?

Frisk: Yes, why?

Myral: Well, sorry if I'm telling you this, but I heard that pregnancy between monsters and humans is very easy, it only needs to love someone with your entire soul and bam! You're pregnant!

Frisk: *cough cough cough* WHAT?

Myral: Sorry Mrs, I shouldn't have told you those things...

Frisk: No no, don't worry, I only mean, why should it happen only now? I am engaged with my husband since I was thirteen, why now?

Myral: It requires some years after the wedding...

Frisk: Well, I- I don't think it's that, I think it's something else

But then someone knocked at the door...I felt like I was going to throw up everything again so Myral spoke for me...

Myral: Come in!

It was Sans

My eyes lighten up...Sans ran in my direction and grabbed me by my arms

Sans: Frisk, how are you now?

I tried to gesture him that I'm not okay, I was trying to hold myself to not throw up, I think he understands and picked me

Sans: Miss, tell the principal that I'm taking Frisk home ok?

Myral: Sure Mister

And we got out off my office

Sans: Frisk, are you okay if first, seeing that we're here in the hospital if we visit you?

I gestured him that it doesn't mind for me, so yeah, someone can visit me

Sans: Okay, first thing first, find a doctor.

I gestured him to go to the elevator, he understands and he helped me walking. Once inside, I pressed the button "4" and the elevator started to go down...there is a friend of mine, Carole, sometimes we get coffee together

The elevator opened and I found Carole in front of me

Carole: Frisk! What happened?

I couldn't speak, so Sans did it for me

Sans: She's not feeling well, I don't know who you are, but can you visit her?

Carole: Sure! Frisk, grab by arm, I'm taking you to my office, and you (referring to Sans), can you stay here?

I gestured her that I wanted him with me

Carole: Frisk, I don't understand you!

Sans: She said that she want me with her, after all, I'm her husband

Carole: Ops, sorry, you can go with her, but anyway, follow me

We followed her and I layed down in the bed in her office, Sans was squeezing my head for calm me...

Carole: Okay Frisk, I'm going to touch your belly, so try to gesture if it hurts okay?

I nodded

She touched my belly but now, I HAD to throw up, so I gestured Sans to take me in the bathroom

Sans: She needs to throw up

Carole: Okay, I will prepare the thermometer

Sans took me to the bathroom, took my hair so I couldn't throw up on them and I vomited...

Frisk: *cough* *cough*...crap, much better...

But suddendly I felt weak, so weak that I was even falling down but Sans took me before I could touch the ground

Frisk: Thank you...

Sans: Frisk, you're scaring me...

Frisk: Don't worry, I'm okay now!

I could see very well that he was thinking in his mind...

Frisk: We can go back to Carole's office

Sans: Are you sure?

Frisk: Yeah...

We went back in Carole's office, she was waiting for us

Carole: Better?

Frisk: Yeah...

Sans put me on the bed, and Carole visited me with the thermometer

Carole: Uh, strange.

Sans: What is it?

Carole: I thought she had a fever, seeing she vomited, but surprisingly, she is normal with the temperature...

I was surprised too

Carole: But if I were you Frisk, I should take some rest, stay at home for a few days and then you'll be better than ever!

Frisk: Okay...

Sans: And I will take a rest too from my job, now I will take care of you

Frisk: *smile* well, thank you Carole

Carole: No prob

We got out of her office

Sans: Hey Frisk, would you mind if I use teleport

Frisk: I don't know, well, it's from many years that I'm used to it, but I'm afraid that I would only throw up everything again...

Sans: As you want, we will take the long way

We took the elevator and then, we arrived at the parking, at least it's Sans that everyday takes me to the hospital and then he takes me at home...it's lucky that I have the morning turn, so in the afternoon I can stay with the love of my life...

He sat down on the driver's seat, he sighed...

Sans: Frisk?

Frisk: Hm?

Sans: How are you now?

Frisk: I feel a little better, thank you for asking...well, what do you think about inviting Papyrus and Mettaton for dinner since I'm going to stay at home for these days?

Sans: Why not? Papyrus would be really happy to see you!

Frisk: I'm going to cook!

Sans: No, no, absolutely NO. You're sick, so I will do it!

Frisk: But Saaaans!

Sans: Not hearing you!

Frisk: Oh c'mon, I want to do something!

He stood there quietly...

Frisk: Saaaaans

No response

Frisk:...okay...

Sans: Good girl!

He started to drive in our direction...hey, he asked me before if he could teleport, then why did he come to take me even if he could simply teleport?

Frisk: Hey Sans?

Sans: Hm?

Frisk: Why didn't you directly teleported to take me home?

Sans: Well, I never told you, but sometimes teleport is tiring me out

Frisk: Then why did you asked me before to teleport?

Sans: I felt energic that moment

Frisk: Hm. Capiche...

Then, silence...

Sans: What did you feel exactly when you called me?

Frisk: My belly was hurting, and I needed to throw up...I think I got a virus, nothing else

Sans: Got it

But when I looked at him, I thought he was deeply thinking...

Meanwhile, we arrived home, I called Papyrus and Mettaton and invited them, fortunately they could come, when I looked at Sans again, he was still thinking...

Frisk: Sans? Is everything ok?

Sans: Hm? Oh yes, everything's okay

Frisk: Hmmmm...

Sans' POV

By Frisk's description, it looks like she has a virus, or she's pregnant. For the first option, I can cure her in just a day, but for the second...heck, thinking about being a probably future-dad it makes me think, for the monsters-human couple it only needs a big love in a certain moment of our life between husband and wife, not to do THAT. And that's not embarassing luckily...

Frisk: Sans, wouldn't you mind if I go out for buying something a moment?

Sans: Are you feeling okay now?

Frisk: Yeah, and don't worry, I don't have any fever, and I'm feeling a lot better!

Sans: ...okay, but bring your phone with you, in case you don't feel well...

Frisk: Okay!

She kissed me and she left...I started to prepare dinner...

Frisk's POV

I was thinking again about Myral's words...

"I heard that pregnancy between monsters and humans is very easy, it only needs to love someone with your entire soul and bam! You're pregnant!"

I needed to buy a pregnancy test, just to be sure that I was only sick, because I'm not ready to become a mother, even if that is beautiful, but being scared it's natural for everyone, so I don't have any problems...

I told Sans that I was going out for buying groceries, I guess I will have to buy that too...

Before going to the supermarket, I went in the nearest pharmacy and asked a pregnancy test, after that I went in the supermarket and bought something for dinner, and then went back at home

Papyrus and Mettaton were already there

Frisk: PAPY! TON-TON!

Paps & Ton-ton: FRISK!

I hugged them and then helped Sans with dinner...then I remembered the pregnancy test. I closed myself in the bathroom and read the instructions: one line negative and three was positive, so if I find three lines, I'm pregnant. I tried it, and when I looked at it again...my hands were shaking

It had three lines.