Undertale Lemons or Smut

What is sex? (underswap sans x innocent reader)

The picture above just pretend that it is underswap sans caused it look like the most innocent sex. Btw, this is a 1st person view not a narrative P.O.V. so I'm not gonna say clit, dick, etc.
(Y/n)'s P.O.V.

It has been three years since you have moved in the skele-bros house. Papyrus and Sans always keep me company whenever I felt lonely. Papyrus was like a big brother to me, however Sans was different. Sans were always energetic and sweet towards to me. It made me feel really warm and fuzzy in the inside. I asked Asgore to knit me a sans plushie for christmas. And ever since he gave me this plushie I always keep it with me always, but usually hide it from sans so he would not be weirded out by me.

Today, this morning, Me and Sans were playing in the attic (okay pls think there is a attic k) until we heard some strange noise coming from Papyrus' room. Papyrus and Mettaton (robot form btw) were hanging out together inside. We were worried what was happening over there. So we decide to peek in one of the holes above papyrus' room. We were amazed on what they were doing. We saw Mettaton was licking and sucking on this strange orange looking rod attached on papyrus' waist. We kept watching them doing somekind of wrestling. It went for hours, doing different positions and actions. After some time they finally stop and went to bed, hugging each other tightly.

Ever since, this morning, the warm and fuzzy feeling was overwhelming me. This evening, I saw Sans was blushing like a blueberry while I was in his awesome room. It went silent for a while until Sans started tugging my shirt.

"I, THE GREAT SANS WOULD LIKE TO ASK YOU A QUESTION HUMAN!" Sans exclaimed. "Can we try doing that strange wrestling. It looks like fun" while holding both of my arms. I nodded and look at Sans's star shaped eyes. "Great! So were do we start?" Sans asked.

"Um, I guess we should start kissing and putting your tounge in my mouth." I replied.

I went closer as Sans started forming his tounge. I opened my mouth waiting for Sans to put his tounge inside my mouth. Sans started licking my face like a dog. I was about to say something until he pulled me into my first passionate kiss. He explored ever inch in my mouth which cause me to make a delightful sound (she basically moans k). I pushed his tounge out of my mouth and put my tounge into his mouth. Sans was suprise at first, but soon let out a delightful sound(okay every time i say delightful sound or sound of pleasure its a moan k). I explore every part of his mouth. We soon stop and pulled our tounge out letting out the mixed saliva out of our mouth. I climbed onto sans and kiss his cheekbone.

"Something is growing in my shorts. (Y/n) do you know what it is? Sans asked.

I quickly get off him and kneeled down to his crotch. I notice a glowing blue bulge under sans' shorts. I pulled down his shorts and saw the same strange rod, except it was blue. I notice it was leaking some kind of blue liquid and pulled my head closer to his blue rod. I lick the top of leaking rod. Sans groaned as I started to lick up and down on his leaking rod. It somehow tasted like blueberries, yummy. I quickly put the whole thing in my mouth and started to bob my head up and down. Sans let out another delightful sound and was basically drooling on my head. It went on for a while until I felt the rod was throbbing. Sans quickly grab ahold of my head and pushed it down as I felt the warm blueberry liquid rushing in my mouth. I actually enjoyed it even though I choked a little bit.

"Sans, that was amazing!" I exclaimed.

"Of course it is amazing, for I the Great Sans is awesome at everything." Sans said with a cheerful tone. "Lets continue the strange wrestling!" Sans said while taking off his battle armor.

I started taking off every piece of clothing I have and lay down on the race car bed. I notice that my hole was leaking liquid.

"From what I saw this morning I am supposed to lick and thrust my finger there." Sans said. "I wonder how does it taste like?" He questioned as he pull his head closer to my leaking hole.