"I wish I could change anyone I want into a lesbian just by pointing at them and saying the phrase 'become a lesbian', and that everyone remembers the person as being a lesbian, except for me." The stone glowed, granting her wish.
But unknown to her (since this was the first time she used the stone since the previous night, as far as she could remember), the stone she had was The Twisted Stone, and her wish would get twisted in some way that still fits what she said, but will be granted in a different way than what she expected.
