Suggested by @/antisepticbiscuit on Instagram

"Are you sure about this?" Dark asks nervously. "Of course I'm friggin sure!" Anti shot back. "Okay... I just don't want anything to go wrong..." Dark sighs. "Don't question my plans!" Anti sighs. "Alright, let's do this!" Anti smiles as he grabs Dark's hand. Then, they both step into the platform.
A few moments later they both step off of the platform. "Anti..." Dark says. "Yes?" Anti replies. "How do you live in this tiny body?!" He asks. "Hey! It's not my fault Jack has such a tiny body! Blame him not me!" Anti replies. Mark lets out a small growl, but decides not to make anti mad. He is stronger, after all. "Anyways, I think that we should pay Jack and Mark a little visit." Anti suggests. "But they'll be confused as hell." Dark says. "That's the point." Anti smiles.
Anti's POV:
I broke into Jack's house and found Jack cowering in fear. "Dark? What are you doing here?!" Jack asks. "Jack, relax. It's me." I reply. "Wait, Anti?" He asks. I nod in response. "Why are you in Dark's body?!" He asks. "We switched bodies for the day." I reply. "Stay back!" He demands as he grabs a knife. "Jack, you do realize that I can make knives appear out of thin air, right?" I ask, making a knife appear in my hand. Jack just stands there, nervously pointing the knife at me. "You wanna say that again?" I ask, holding the knife up to his neck. "No." He replies. "Good." I smile, then took the knife away from his neck.
Dark's POV:
I quickly headed into Mark's house, but he was no where to be seen. Eventually, I found him in his bedroom. "H-hello?" He asks in fear, as I walk through the door. "Well hello." I smile. "Anti?! What are you doing here?!" He asks. "Mark, it's me. Dark. Anti and I switched bodies for the day." I explain. "Stay away!" Mark says nervously, getting closer to the wall. I slowly walk closer to him. "Is Jack dead?!" He asks. "I don't think so." I reply. "You know what, this is taking too long." I sigh, and use my powers to make him feel pain. "And now you can say that you've had a visit from Anti." I smile, and fade away to meet up with Anti.
~Time skip~
Anti's POV:
"Dark, can I ask you a question before we switch back?" I ask. "Sure." He replies. "Did you hurt Mark to frame me?" He gulps, and takes a deep breath. "Well..." He starts. "You didn't." I stare at him. "Sorry..." He sighs. "I would kill you, but then I'd be killing myself." I say angrily. And at that, they switched back, and learned never to do it again.