My girlfriend is an amateur witch.
What she decided to do today was bit different from the light stuff she's done other times.
"I was thinking. I would like to know what it's like to have sex with a woman."
"Well I mean, if you are curious we could find someone for a threesome."
"No, that not how I meant it. I don't want to cheat on you."
We were both in kitchen having a breakfast. She took out her spell book and recited some words. Bright light appeared and hit us both.
I watched a bulge growing and lifting up her skirt. I realized what was going on and immediately reached for my crotch, it was gone.
I saw her get higher, but at the same time it was me who was getting shorter.
She began giggling, her giggling sounded deeper and deeper with every second. Her face reshaped, defined jawline, masculine traits, shorter hair. While my face got softer, more petite and hair grew reaching my shoulders.
"Now this is just fantastic, so I'm going to be THE woman you want to experience sex with." I said in my now high pitched voice.
Her boobs started disappearing and at the same time they were growing on my chest, which was very odd while pleasureable feeling.
She took off her necklace "Take it, it will look great on such a gorgeous woman like you."
"Just so you know I will tolerate this just cause I love you and just for today."
Each of us dressed in some of other's clothes and since it was hot sunny day, we decided to go to the beach. After day spent at the beach as opposite sexes I got some tan lines from wearing bra whole day. We arrived home both considerably turned on and laid naked on the bed and finally got to the main goal of this event.
I grabbed her penis looked her in the eye and said: "Take me big boy."
We've had some of best unprotected sex in my life. Reaching climax as a woman was incredible, I didn't cum only once, but multiple times that night. We did all sorts of things you can imagine. I got my pussy licked, while unfortunately I had to suck her off as payback. We even tried anal, which was still pleasureable, but didn't beat normal sex. I was almost sad it was going to end, maybe I could suggest we try it some other time again I thought.
The only catch is, that next day, when she cast spell to turn us back, she was the only one to turn back. She consulted with her witch friend who explained to her that getting the changed person pregnant makes the change irreversible.
"Well, ha.. ha.., at least you don't have to worry about those tan lines. But on serious note, I will love you no matter which gender you are. I enjoyed yesterday very much."
I was shocked from not being able to change back, but at the same time I enjoyed being woman too, so I thought I could learn to live like that.