"I've always wondered what happened to me and you in those worlds I accidentally created," Starlight said, turning her teaspoon in her chocolate mug.
"I'm not sure we were even there," Twilight replied. "I'm not sure they were full realities, not when I saw them at least. More like possibilities, not fully realised yet. Zecora said something about it when I met her in one of them."
"But they still ought to have had a Twilight and a Starlight," Starlight argued, taking a sip from her mug.
"Maybe us being the centre of the spell meant they didn't immediately. The map was always there, and I was there with it," Twilight replied. "So maybe I was the only Twilight there. Since neither of us was supposed to exist as we do in a different reality, maybe I would have been erased away in time."
"Hmm." Starlight pursed her lips. "Maybe I didn't create worlds. Maybe what you saw were reflections of other worlds that do exist, somewhere out there. Or that could exist. But you only walked through a reflection of them."
Twilight pursed her lips too, thinking for a bit. In the end she sighed. "This is why time travel spells are banned."
Starlight nodded, and sipped some more chocolate.