Warning: If you don't know what a Yandere is, it is someone with a love obsess and would do anything for the crush's love. Usually they harm those who loves the crush too and pretends to eliminate them.
BTW in this story Chara and Frisk are males.
...
Previously, Alphys called Undyne to investigate Mettaton's murder, since there isn't any detective in Undertale, I will participate in this story as a police woman, telling it in the third person. And by the way, I don't know if I should call myself (a/n) or just Allie, Allie isn't my name, it's just a nickname... I think I'll call myself (a/n)
Undyne, Alphys and (a/n) were in MTT, where Mettaton died. (a/n) were examining the body. "Alphys, please pass me equipment to look for the fingerprints" (a/n) asked, Alphys gives it. "No fingerprints...hum..." (a/n) said "The unique reason for the killer don't have fingerprints, it's because they doesn't have skin, excluding Chara from the list." Undyne was getting angry
"Ngaaah!! Can't you see that it was the Sans?! Look at the bone attack!!" Undyne said "Shut Up, Undyne. What if someone used the bone to incriminate the skeletons? And how can you be so sure it was Sans?" "Because Papyrus wouldn't do that!!" "Oh really? What if Mettaton made something horrible to Papyrus?" Undyne didn't know what to say, she just stayed quiet.
"Hey, I took a look at the camera while you were fighting. (y/n) and Napstablook were here before the murder, Napstablook seemed to be shouting at Mettaton, and them he ran away with (y/n) running behind" Alphys said
"What next?"
"After that, Mettaton kept at MTT and the camera stopped working"
"Let's call Napstablook and (y/n) to interrogate them, after that, we are calling to the Skelebros too"
After hearing yours and Napstablook's point of view for what happened and the Skelebros arriving
"Sans, why did you murder Mettaton?" Undyne asked "I didn't Undyne! Stop always picking on me" Sans said annoyed.
"It was Papyrus" (a/n) said, everyone look, surprised. "H-how do you know?" Alphys asked
"Sans wouldn't have the strength to take off the bone in Mettaton's belt and pierce it in his neck. Even if he used magic, Sans couldn't have stepped so hard in Mettaton's legs to break it, Sans doesn't do any physical activity to have the strength to. But Papyrus do..." Everyone look at Papyrus who were sweating, but gave a smile and nod to someone who were behind the three girls, the person kills Undyne before she could react. (a/n) takes her gun and aim to the person, surprisingly, the person was Frisk. Another person came behind (a/n) and kills her, it was Chara. Soon, Alphys get killed by Frisk.
After Chara and Frisk freed Sans and Papyrus, they walked together back home. "Good work, Frisk" Chara said. Frisk didn't felt good about it. "Oh, you don't feel well about killing? Don't worry" Chara cut Frisk's neck and left the boy on the ground.
"I already killed mom and dad for us, (y/n). You don't need them to take care of you. I will."
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(art made by KyubeyGirl, I edited to make sense with our story)
