After a hung out of vessels, Kris was walking back home along UltSans.
UltSans: "You know? We actually should have more reunions. You know, like... Welp, whatever that was."
Kris: "Sure, I guess."
UltSans: "Dude, you're always this negative? I mean, you look like you're an emo teenager."
Kris: "... Sure."
UltSans hesitated for a short moment with an blunt expression as makes his lips be moved to the left and back by being stretched and pulled with force back.
UltSans: "... Bruh..."
After a moment, both reached Kris' house. Kris hesitated as there was music being played, so ignored UltSans and opened the door.
In the living room, Sans and Toriel were dancing in an awkward dance of moving left and right their waist along the arms until bejng close and then grab eachother's hand to then pose and get back to a loop.
Both Kris and UltSans hesitated, Kris frustrated as this isn't the first time, while UltSans had a very traumatized and disgusted expression in a very dramatic way.
Kris: "Ugh, not this again..."
UltSans: "Wait, what do you mean with again?! Has tbis happened before??"
Kris: "Yeah, this is the second time the shopkeeper dances with my mom..."
UltSans: "Shop... keeper...? Wait, what? You mean... your Sans... has grabbed the shovel?... Ain't no way, bruh. Ain't just no way."
UltSans then started giggling and laughing. Kris felt ashamed and awkward. But UltSans didn't lost any time and got his Voidsphere phone out and sgarted recording both dancing for few seconds as they did an entire loop of the dance.
UltSans: "Hey, wanna take the honor? Is your mom, so... I guess you should be who has the honor, right?"
Kris hesitated, wondering what he meant. But UltSans was saving his Voidsphere phone and then lifted his right hand again but holding a shotgun, a d with a single move he charged it and ready to shoot.
Kris remained frozen for few seconds glancing the shotgun, and then quickly grabbed it and went running inside. UltSans ran behind Kris.
Kris shot the music, stopping it instantly, and surprising both Sans and Toriel, but before anyone could say anything, UltSans ran towards Sans and grabbed him from behind and lifted him by having his arms under Sans' armpits.
UltSans: "Do it now! Go ahead and shoot, doesn't matter if you hit me, do it! Fuck his ass!"
Kris then started shooting at Sans multiple times, before UltSans dropped him and both started kicking Sans.
UltSans: "Fight back! Fight back, bruh. Come on, fight back."
After a short moment, and also of ignoring Toriel.
UltSans: "Wait, I know someone who would absolutely love to fuck his ass hard."
UltSans opened a portal, and dragged Sans through it. UnderFell Sans wondered, until noticing was UltSans.
Red: "Oh, hey asshole. What you doing with Classic?"
UltSans: "Oh, no. He isn't Classic. Gladly he is not. Check this out."
UltSans showed UnderFell Sans the video, who also got traumatized and remained very surprised in a very bad way.
Red: "... Holy fuck... Let beat his ass."
UltSans: "We already did. This kid is from the same universe as this disgusting pile of bones. Glad is a completely different world. Still, I brought you him for you to fuck him as we already enjoyed that. Enjoy the free Exp."
UltSans then left along Kris, and the portal closed. UnderFell Sans hesitated, but after a short moment, he moved closer and leaned against Sans.
Red: "Well, well, well... Good for me. After all, down here is kill or be killed. No weak remains alive if is not tolerated. And you, bonehead, got a ticket to dust."
UnderFell Sans then started using his magic go attack Sans. Using lines of flying sharp red bones, four eyes blasters, a bat with golden spikes in the top, and a golden knucles knife with spikes.
UnderFell Sans got some good Exp from killing Sans in such assault and torture, and the best part is that killing Sans did not alter UnderFell Sans' timeline's pacifist route.