I need more somewhat happy Sans, so here.
"Oh, Bryan, don't be like that!" Chara laughed, not being too fond of how I began to ignore them
"I trusted you." I sneered, watching the lava around me as I held my jacket in my arms.
"How could you expect anything different?" they nearly cackled, sending chills down my spine, "I'm a malevolent spirit. Do you really think I'd do anything but?!"
They're right. How could I have thought differently.
"Really though," They stared me dead in the eyes, voids beginning to replace the red, "deception is a simple little thing. Tell them a few truths, then test the waters with some lies."
I just grit my teeth, ignoring the monstrosity once again.
"I mean, of course you'd know. I learned from your mind." Chasms that were once eyes watched me, a malicious grin plastered to their lips, "I've never had to use that trick, before. I gotta say, you really shoulda known better."
I reached for the door in front of me, knocking on the material. It wasn't wood, that I knew, but it couldn't be metal, either.
"Don't you dare judge me on past mistakes." I spoke in a low growl, my eyes beginning to narrow, "I did what I had to do, then it was a matter of surv-"
"You say that, but do you really believe it?" They leaned against the wall next to the door, eyes returning to its normal form as they reverted to their bored expression, "Do you really believe what you've done is justified? All the pain you've caused for those around you? All the looks people would give you because they know what happened?" The grin returned, wider than it had previously been, "You're even more sick than I am to believe it was 'just a matter of survival.' This world isn't a kill or be killed. It's live a boring life or fill it with thrill."
The door opened, the yellow monster deciding to peak out of her natural habitat to answer.
"H-hey there, Sans." She gave me a weak smile, almost as if she knew I needed reassurance.
"Take a good look at her, Sansy~" Chara sung, gliding their finger over their neck, "She'll be as good as dead before you can cry for help."
I put my hand into my pocket, fingers searching for the on button of the 'shock me' remote, "Hey Al. How's it been?"
"I-I've been o-okay, I guess." She stammered, looking over her shoulder, "W-would you like to come in?" She opened the door a bit wider, backing up to let me inside.
"Don't mind if I do." I gave her a chuckle, glad to take up her offer.
Quiet cheering came from the living room.
"Got someone over?" I put my jacket back on, shoving my hands into the pockets, "I can come by later."
"U-Undyne and I are just watching a show." She closed the door, leading my to the chanting, "We're watching Naruto. I've a-already seen it, though, s-so I'm trying really hard not to spoil it."
We stepped into an open room, a fish lady seated on the floor, staring at a screen roughly ten feet away.
"He dies." I pointed at a smiling man on the screen, honestly unsure of what I said... but he does look like a villain, therefore he's got to die, eventually.
"Don't spoil it!" Undyne began to shout at me, whipping her head back to glare at me with one cold eye.
"Sorry. Halibut." I shrugged, on the verge of laughing my ass off.
Chara groaned as the womens' faces began to sink in either irritation or disbelief.
"Oh." She sat up, still watching me, "You're the one with the brother who wants to be in the guard."
"Guppy as charged." I tapped my fingers against my stomach, suddenly frowning at the growing pudge. It's only been a while since I fell. How could I let myself go? ... Maybe I should get back to working out. It'd do me some good.
... Nah. Maybe in the next life.
"You mean when you reset?" The demon in my head chimed, wicked grin on their face.
"Hey Al?" I turned my head to look at the dinosaur woman, "You mind if I mooch some food offa ya?"
"I... d-don't have much." She stammered, looking down to the ground, "A-and..."
"I'll pay you back tenfold. Promise." I reassured her, moving over to the kitchen.
"A-and you're also w-ithout a job." She followed me, leaving her buddy with the T.V.
"I'll ask Gaster for the money." I shrugged, immediately going to the fridge, "I'm not going to take much, I promise. I just-"
"Y-you know Doctor Gaster?" Her eyes lit up in a childish light, "W-what's he like?"
An asshole with two personalities, one having threatened to kill me to protect to other and one actually trying to kill me for science, "He's an okay guy, I guess." Nothing looked edible. Of course, it wasn't. It was all monster food, "You know what? I changed my mind. I'll grab something at home."
"How d-did you meet Gaster?" She was practically bouncing up and down, watching me with anticipation, starting to talk fast, "D-did you meet him on the road? Or maybe just stumble upon him in a restaurant? Oh! I know! You went to see the king, and there he was, standing right in front of you! O-or maybe it was,"
"Whoa there. Calm down." I gave her a hesitant laugh, waving my hands in front of me, "We're just 'brothers.' We live in the same house, if every you want to meet him... since obviously you're a big fan."
She looked as if she were screaming inside, absolutely consumed with joy.
I looked back into the living room, the T.V. still on and Undyne's cheers becoming a little louder, "Is it... too late to join you two in your shows?"
"N-not at all!" She laughed, probably the first honest laugh I've heard from her by the looks of it, and motioned toward the room.
That night, I ended up having to crash at her place. What can I say? The show was starting to get good.