Soon she grew, getting taller and older, her breasts swelling quite a lot, until she was a teenager too. It was hard to believe that this hot girl was the little baby I had brought in here. Then she kissed me, and we started necking.
But soon she started to cry. "What is it, Carrie?" I asked.
"I have to tell you," she said. "I discovered it yesterday. Your long lost sister, the one who disappeared at the age of 2 and was never seen again... it's me!"
I wondered just what kind of reality I had made by wishing my sister to be my girlfriend. I pretended I knew nothing was going on and said "What? We..."
"We've been dating for over a year," she said. "And I love you! But now I find out I'm really your sister! How can we do this? Sooner or later someone's going to find out...."