The spell backfires...

The preparations were extremely cautious. The girls built circles of salt, painted spirals on their hands in curious shades, and all sorts of actions you did not understand the purpose of. Then Judy did... stuff... with some of her most expensive crystals. You apologised profusely for the waste, but she winked and said she'd always wanted an opportunity to use some of them.

As the tension grew in the room, you could feel the sexual desire increase. Nobody was watching you: Isaac was concentrated on the colourful orbs in front of Anja, Sally was busy chanting, and Anja herself was tracing complex runes in the white sand she'd pulled from the reserves under the aquarium. Judy was the busiest though, as she was finishing a complicated merge of multihued crystals.

You couldn't help it. Before you'd realised what you were doing, your hand was inside your unzipped jeans and you were rubbing your nib, riding a wave of excitement to orgasm. You were so lost in the pleasure, your eyes closed, that you missed the black cloud that suddenly engulfed everyone. You heard Judy's yelp and angry reaction. You heard Sally's tense shout, you heard Anja's painful cry. You opened your eyes and you couldn't see a thing in the reddish smoke.

As it evaporated, you quickly zipped your jeans and got up. Looking through the window, you realised the cloud of smoke must have been absolutely huge: smoke was evaporating down the street, as far as your eye could see.

"I.. think... we may have a problem..." said a husky, sexy, feminine voice.

"A big problem..." added Anja.

You turned on your heels almost instantly, dread settling as an ice ball in your stomach.

Your brother met your eyes. You froze.

She was gorgeous, and she was obviously frightened. She held the much-too-large jeans in her hands, his shirt hanging loosely on her.

"I think... I think we fucked up." Isaac-as-a-woman said.

"No. We broke the spell." said Judy decisively.

"Sort of." added Anja.

"We destroyed the impermanency." concluded Sally.

"I think we also extended the effects to the whole city..." you suggested.

"You're right." said Judy. "The cloud was local to your city and my office. I think you did something that amplified the side-effect..."

You blushed. She smiled at you.

"Don't worry. We should have planned for this possibility, so it's kind of on us... well, I think all of us are going to have incredible libido for today and tomorrow, and everyone will be attracted to you. In fact, in your city, everyone right now is female, and everyone right now needs incredible amounts of sex. Don't worry. I expect the Mayoress to enforce a quarantine within minutes... how lucky you are to live in a city with female leadership, aren't you?"

You realised she was right. The Mayoress would quickly react to what looked like a weird gene-weapon attack. The Guard would surround the city sufficiently far away to avoid consequences. Your accidental input had removed the most dangerous factor from the equation for you and the girls... but you also realised the city would soon turn into the largest lesbian orgy in the history of humankind, and it was all your fault.

And you couldn't wait...