A weird thing happens as you swear at your sister

Another day of school goes by, and more information begins leaking out from various cities under quarantine. Most of it seems to be trolling though, shemale japanese schoolgirls and furries in Germany. Still, life moves on as usual, and you return home after a frustrating day at school..

Your sister, Janice, barges past you without a care, just as you were about to go to the bathroom, hijacking it for herself. "I was on my way in there, you body obsessed slut," you growl in hushed exasperation through the door.

She answers with her own retort, but you are already on the way downstairs to borrow the other bathroom in the house so you barely hear it.

As you return upstairs a quarter of an hour later, Something feels... off. And when you see Janice on her way back to her room, you pause at the sight.

She too stops and glares at you, with a hint of confusion on her face. "What happened to you?" she asks.

"Erm, I was going to ask you the same question?" you reply as you shuffle a bit closer to get a closer look on your sister. Her outfit was outrageously slutty, her hair was bleached blonde, her body was definitely trained a lot harder than it had been fifteen minutes ago.

"Really?" she asked and glanced down at herself. "Oh. I see. I've changed too? This is... weird. I sort of remember, but I'm feeling like myself," she said as she adjusted her tight tube top without a care in the world. "Oh, you called me a body obsessed slut, right? That sounds like an apt description of me now. God, the memories," she sighs and licks her lips with her eyes closed for a moment.

"Uuh, I guess I did? What does that have to do with this?" you ask, confused.

"Well, look at yourself! You look just like what I called you in response:"