Sans pov
me and papyrus had agreed to babysit frisk for the night. Me and paps were watching tv while frisk was playing. Paps took a glance at the clock then stood up "human, it is time for bed" he declared. I also got up and grabbed frisk's hand "yeah, it's time to be put under a-rest" I said, looking to paps for his reaction. He took a deep breath "sans this is not the time" he said calmly. I turned the rest of my body towards him "you're right bro it's not the time, this is" I said holding up a thyme leaf. Papyrus didn't say anything, he just walked to his room. I returned to the kid to find her giggling up a storm "alright come on kiddo" I said walking frisk to her room. Once we got there I read to frisk and left for my own room. I got in to bed and tried to sleep but that failed.
After laying awake for 'bout an hour I got out of bed and made my way to the kitchen but when I got to the bottom of the stairs I was surprised to see frisk looking in the fridge. I went into the room "frisk" I whispered, getting her attention. She looked towards me with a scared expression until she saw that it was me "oh it's you, you scared me" she said, relieved. I chuckled and put my hand on her shoulder "sorry but what are you doing out here so late" I said. Frisk seemed a bit freighted "well, I had a nightmare so I came out here" she said. I got an idea from that "how 'bout we go for a walk, it might calm you down" I offered. She was a bit worried "will mom be mad that I'm out at this time" she asked. I smiled (not that she could tell) "not when I explain what happened, now get you're jacket" I said making her smile. She left and came back with a purple jacket with a open zipper and her hands in the pockets.
We left the house and started walking with no destination. I looked at frisk to see she was still shaken "so what was that nightmare about" I asked, but instead of an answer frisk just grabbed my hand and rested her head on my side. I took that as she didn't want to talk about it, so I didn't push it. She looked more comfortable now "why couldn't you sleep, usually you can do it with your eyes closed" frisk said catching me off guard, I started laughing out of control "i taught you well" I complemented. After that we told each other jokes for a few minutes until frisk stopped walking "whats wrong kid" I asked trying to see what she was looking at. Then I did see it, it was tori sitting alone on a grassy hill, looking up at the sky. Frisk smiled and ran up to her with me following slowly behind.
Toriel pov
I was enjoying myself but was also feeling lonely. Then I heard my name being called from behind me. I turned to see frisk and sans "frisk what are you doing here" I said as she jumped in to my arms. Frisk didn't answer but sans did "she had a nightmare so I suggested we go for a walk, to calm her nerves" he said, sitting down on the blanket I had set up. Frisk let go of me and sat in between me and sans "i hope you don't mind us staying for awhile" sans said, rubbing the back of his neck. I was glad that he asked "of course, I would never turn you two down" I said starting to blush. He nodded and we all turned back to the stars.
I was entranced by them "the stars really are beautiful" I said. Sans nodded "yeah, I'd give em a gold star" he said scooting a little closer to me. I burst out laughing at his joke "wow that was a great pun did you planet" I shot back scooting closer to him. Sans' grin grow wider "whoa you need to comet down" he said. At this point there was little to no room between us "speaking of space, I have none" frisk said, trying to get out from between me and sans. We separated so that frisk could get out. She sat back down next to me. After a few more minutes of watching the night sky I was getting really tired. I yawned getting sans' attention "are ya tired tori" he said, seeming worried. I nodded "yes but don't worry my friend, I am quite alright" I said. Sans pointed to frisk "seems like the kid is" I looked at frisk who was asleep. I smiled at them "come on sans, lets get them to bed" I said picking frisk up.
Once we got back to sans' house I handed frisk to him "well, good bye my dear friend" I said turning around. Sans grabbed my hand "wait!... I mean do you want to stay the night" he said. He rubbed the back of his neck "i wouldn't want you to walk all that way alone and in the dark" he said. I accepted his offer and walked in. I waited in the living room while sans put frisk into bed. He came back out and showed me to the guest room. He opened the door to let me in. I went in and turned around "thank you sans, you're very sweet" I said kissing him on the forehead. Sans froze for a moment then he collected himself "no prob tori" he said closing the door. I turned back around and got into bed.