Collaborative sex stories let us write the plot together

(Her Secret Fantasy, continued by Wifes-out...)

You take Rachel by the hand and begin exploring the magical castle. The moving staircases lead you up a tower and you turn into a classroom.

“Greetings, what brings you to my class?” It’s the aging Professor McConagall, peering at you over the top of her small glasses sitting half down her nose, with her greying hair in a tight bun.

“We would like to learn some spells,” you reply.

“Transfiguration is some of the most complex and dangerous magic you will learn at Hogwarts. Anyone messing around in my class will leave and not come back. You have been warned.” She then turns her back to start lecturing.

You begin to experiment. Concentrating hard, you flick your wand at some books lying on a nearby desk. They magically transform into a bright pink dildo.

Professor McConagall turns around. “Human transfiguration is the most difficult.”

With another wave of your wand and right before her eyes magic fills your loins. Your cock enlarges, pressing tight against your slacks. The shaft lengthens down your leg leaving nothing to the imagination as to its new gigantic size.

McConagall is clearly flustered as she stares at it and puts a hand sensuously but unconsciously to her throat. “I see you have a natural talent.”

You adjust your monster dong. “What else should I use my enormous talent on?”