This is a Yandere Dipper Gleeful x Reader one shot

Third Person Pov
Y/n happily walking to the Tent of Telepathy with her boyfriend Dipper Gleeful. He waved to crowd surrounding them with his girlfriend clinging to his arms. Everything was perfect for the couple. Well is it?
They made it in to the tent. Dipper kissed her forehead before going to the stage as she wish him good luck.
Y/n stayed at the backstage until something caught her eye. It was a picture of Dipper and a girl that looked like him.

'I wonder who she is' Y/n thought looking at the picture 'Is she his friend? His sister? His twin?' She keep thinking until her head suddenly ached  'You are worthless!' a voice suddenly came into her head 'What a freak' another voice came. Y/n was really confused where all of this is coming from maybe something in the past? She tried remembering whatever it is but she couldn't remember and then Dipper came back. Her blank face got replaced a smile and Dipper saw the picture and frowned. He took it and hid it in his pocket and walked to Y/n and wrapped his arms around her shoulders and they walked home.
While they are walking Y/n saw a boy with a pine tree hat that is when more voices came to her head 'Are you okay?' 'Y/n look out!' It was different this time instead of a girl it was a boy's voice. Y/n rubbed her head which made Dipper look at her "Is there something wrong?"he asked "Nothing"she replied with a fake smile. Dipper noticed it, he isn't dumb. He tried reading her mind but for some reason he just couldn't but he is sure that something is bothering her.
They made their way into the mansion and went inside. Dipper excused himself to do his little business so Y/n went to her room and took a little nap
While she was asleep Dipper head down to the basement to do his business. As he opened the door you will see blood all around the room and hear chains moving "D-Dipper?"a weak voice called out then Dipper grabbed the person by the hair "Why hello there dear sister"he said while looking at her fearful eyes. She couldn't do anything but cry "Why are you crying dear sister I thought you liked pain? Do you know the pain that you gave to Y/n?"he said with a devilish grin then throw her "You're nothing but a nuisance"he said and kicked his sister "S-Stop"another weak voice from behind "Aw why? Don't you remember she killed your cousin so why don't you enjoy while it last"Dipper said as he sharpens his knife "No! I am nothing like you!"He just smirked at him "Of course you're not. You're pathetic"he said as grabbed the boy by his collar "M-Master dinner i-is r-r-ready"A scared demon called out his master. Dipper tossed the boy which made William feel bad for him so he mouthed "sorry" before he left
Dipper changed his clothes and cleaned himself and made his way to the dining room where Y/n was waiting. He sat down to a chair across her as they waited for their food but while they were waiting Y/n noticed something red in Dipper's face. She pointed at it and Dipper wiped it off quickly "It is just ketchup"he said 'But we haven't eaten yet?'Y/n thought but she didn't tell him because it would be rude and soon their food arrived and they started eating well Dipper did. Y/n is still bothered from earlier and Dipper noticed she still haven't touched her food "Something wrong?"he asked "No Nothing"Y/n replied accompanied by a fake smile. Dipper narrowed his eyes "Y/n I know you are lying and you know what I feel about liers"he replied. "Um It is just I keep hearing voices in my head"she said "What does the voices say?"Dipper questioned "Something saying I am Worthless and freak and the other one is if I am okay and I should look out?"she answered. It seems very familiar to Dipper. Did he remember? Indeed he did
Flashback
"Mabel what is this all about?"Y/n asked confused after being led an old warehouse "Oh you know what this is about!"the brunette yelled as her amulet glowed "If this is about Gideon I told he's not in to you"Y/n replied regretting what she just said "LIER!"Mabel yelled and stand up "You stole him from me"she said as she lifts Y/n "And I will make sure I will get him back"she said choking her now and suddenly Gideon appeared wet from the rain "Mabel you need an honest break up"he spoke as he went inside "I don't understand"Mabel said confused of his appearance "Look Mabel I don't like you the way you liked me and I am sorry I just don't wanna hurt your feelings"Gideon apologized which only made the brunette furious "THIS IS ALL YOUR FAULT!"she yelled as she tossed the girl "Y/N!"Gideon yelled as he made his way to her "Are you okay?"he asked while helping her get up "You are worthless!"Mabel yelled and tossed a chair to Y/n "Y/n look out!"with that warning she dodged it "What a freak"Mabel yelled once more as she tackled Y/n. Gideon tried to hold Mabel back but got knocked out by her "This wont be the last time you'll see me"Mabel said and with that she disappeared. But there's one thing they didn't know. Dipper saw the whole thing "Oh dear sister I will cause you the pain you did to Y/n and Gideon I will make you suffer for what you put Y/n through"
End of flashback
Since that day no one has seen Mabel and Gideon. They disappeared without a trace. Dipper and Y/n finished their dinner so they brushed their teeth and got into their pajamas. Dipper noticed she was still bothered "Why do I feel like I forgot something. Something really important"she said "Shh just forget about it, It's in the past"he said 'That is why I need to remember it'Y/n told herself in her mind.
Dipper fell asleep while Y/n can't because she keeps having nightmares so she decided to get up which is kinda hard because Dipper was hugging her so tight but she managed to get out. She felt something in her neck and it turns out to be her necklace so she took it off and put it in her jewelry box but then she saw something else. It was a friendship necklace a half of a heart saying "Paz". She took it and heard a noise so followed it and it led her to the basement
She opened the door only to be met by blood. "What the hell" she said and see two people "D-Dipper?"One of them spoke. Then it hit her, It was the voice from her head "Are you okay?"she said while going to the girl. She looked like the girl from the picture "Y-Y/n?" "Y/n Get out of here!"The other one said "Huh why?"Y/n asked and saw the cuts and bruises "Who did this to you?"she asked "I did"a voice said in behind only to reveal
Dipper "What are you doing here at this time?" He asked "What did you do to them?"Y/n asked "I just gave them what they deserves"he replied with a dagger in his hand "Why? No one deserves this"Y/n defended "They hurted you" "What? I don't remember-" "Of course you don't ,remember this?"he said while revealing a hair dryer like gizmo then memories hit Y/n in the head
Flashback
"Paz!"Y/n yelled while running through the halls after hearing her best friend scream. She finally got to the place where she heard only to see her worst nightmare. "P-Pacifica?"she said going to her friend hoping she is still alive "Why? WHY!"she said as tears run down her face "Y/n stop crying it hurts me seeing you like this"Dipper said covered in blood "You. You did this?"Y/n asked with red eyes from crying "I have to" "B-but why?" "I hate her, I hate that she always in your side, I hate it that you spend time with her more than me"he explained "But that doesn't matter anymore she's gone" "YOU MONSTER DO YOU THINK I WILL GET YOU BACK AFTER THIS"she yelled and took a knife "I would rather die"she said while pointing the knife to herself  "I don't think so"Dipper said while pointing a mind erasing gun at her "W-what i-is t-that?" "Just a gizmo to make you forget and get you back when you were Mine" and with that she black out
End of flashback
"You. You killed her!"Y/n yelled as she backed away "Killed who? Oh You mean Southeast?"he said and laughed like a maniac then Y/n tried to punch him but he just caught it then pointed the gun at her forehead. Y/n manage to grab a hold of a knife and quickly pointed it at his chest. Dipper was shocked after feeling a sharp blade at his chest but replaced with a crazed look  "Aw isn't that nice" "Stop with the games Gleeful. I have the advantage"Y/n warned "Too bad"then the knife got pulled by a blue light "You forgot about that didn't you"he reminded "Now back to when you're mine"and with that he shoot Y/n with the mind erasing gun with those memories forgotten.