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You can't bear to tell them the truth. You've been away from them for so long that when you finally did see them, they were so happy that you were alive and well. You are... for the most part. The Winchester brothers were brought here because of a ghost that's killing people without cause. It's not an ideal situation, but you'd give anything to work with them one last time.
You can feel your life slipping away by the second, so you're trying to make these last moments count.
"I don't get it Dean. Something about this case doesn't make any sense," Sam shakes his head.
You three are scouting a closed museum since all the victims have worked at this place. If the ghost is going to show, then it should have shown itself by now.
"Yeah, I agree. This is the hotbed of ghost activity. The EMF reader is going nuts. The ghost should be here."
"Maybe we should split up so we'll cover more ground," you suggest.
"Yeah, that's a good idea. We'll meet back here if we don't find anything."
You split off from the Winchesters before Sam could finish talking. You're feeling yourself bubble over the top, and if you're going to stay in this sweet moment, you can't blow your top with them around. You don't want to hurt them, and that's exactly what you're going to do if you stay with them.
It's been too long since you've been with the Winchesters, and you just wanted to make this last time worth something. You've waited your entire afterlife for this moment. The energy bubbles inside you so much that you finally have to let off steam. Your energy blows out all around you, shattering any glass within a yard of you. You have these moments of instability that just blows whenever it feels like it, and you can't control it no matter how hard you try.
Along with the glass shattering, the energy you expelled caused the chairs, tables, and other items to topple over. Sam and Dean had to have heard it, and you're not so sure you can keep this part of you a secret anymore. Like you predicted, Sam and Dean rush into the room moments later.
You're still angry and unstable, so you're flickering in and out of existence. Sam and Dean watch on in horror as they realize their best friend is dead, that their best friend is the reason people are dead. You force yourself to calm down before addressing the elephant in the room.
"I didn't know how to tell you," you whisper painfully.
"How?" Sam manages to say.
"A demon got to me. He slashed me up good."
"When?" Dean asks.
"Two years ago."
"You've been a ghost for two years?"
"I was dormant for most of it. I wanted to contact you, but I couldn't seem to touch real life items. I didn't know how else to get your attention."
"So you killed six people just so you could say goodbye?"
"I swear, I didn't mean to. Something is wrong with me. I don't know what's happening."
"When a ghost stays a ghost, they become unstable. I know you didn't want to hurt them."
"I didn't. I just wanted to see you two again. You have to kill me," you say with tears in your eyes. "My remains are upstairs."
Dean clearly doesn't want to do that, not after knowing you've been dead this whole time. Sam, on the other hand, knows this is what needs to be done.
"Just know I love you both so much, and I wish things were different," you sniffle, flickering back and forth between the afterlife and reality.