Being a substitute teacher was rough in the best of times, so when I heard about a school that offered triple the going rate for someone to cover for a while semester including room and board, I thought there had to be a catch. There was.
Turns out at Damien's Academy for Gifted Young People or "DAGY-P" most of the classes were in magic! Wizards and witches still had to take some normal classes, which is where I'd be filling in. I was warned that sometimes the students could be a bit unruly, and pranks were common. It should've caught my attention when the administrators promised that at the end of the term they'd see to it that I "went home completely normal", but I was too busy thinking about all the money I was going to be making.
Five minutes into my first class, I learned what they meant by pranks when one of my students - a cheeky eighteen year old boy by the name of Hugo - cast a spell and transformed me into a busty woman!
The whole class burst into laughter and I grabbed him and rushed to the principals office, feeling my new tits bouncing with every step. My clothes had changed too, but my new bra was barely helping. In the office I was met with a nonchalant eye-roll and a casual explanation that Hugo was a troublesome kid, but very talented. Hugo was given detention and I was told to go back and resume teaching. When I complained about my new sex, I was told that since I was still a human, fixing my transformation wouldn't be prioritized. Hugo just had a stupid shit-eating grin on his face the whole time, the obnoxious brat.
Back in class I tried my best to teach, but my voice was strange and I was completely distracted. It was like everything about me was geared to turn me on. Everytime I looked down I saw a stunning set of cleavage. Not used to having tits, my arms would crash into them from time to time and they were so soft. I wasn't used to writing on a blackboard with them either, and they kept erasing stuff, and even through my clothes my nipples rubbing against something sent tingles down between my legs.
Hugo just sat there with his shit-eating grin, watching me. He leaned back in his chair and I could see a bulge in his pants.
That was when I started to wonder if Hugo had done something to my mind as I suddenly couldn't stop thinking about dick. The gap between my legs was aching to be filled, and a cock was the obvious thing to put there.
It got so bad that for my fourth period class, I called my class "Introduction to Cock-ulus." Before quickly correcting.
The students of course all giggled. They knew I was supposed to be a man. My name was written on their syllabi as "Mr."
At the end of the day Mr. Andrews - a fellow "normie" teacher who taught geography - came in to check on me. I'd met him that morning before classes started in the teacher's lounge and he'd given me the advice to go with the flow here.
"Hey-" Mr. Andrews started to say hello as he came through the door, but stopped the second he laid eyes on me. "Damn-" He muttered and I couldn't tell whether as exclamation of excitement or condemnation - "This the work of a certain young wizard Hugo?" I nodded. "Well if it's any consolation, I heard he tried the same thing on Mr. Samson this afternoon. Mr. Samson's a sharp cookie though and had a protective charm on which reflected the spell and now Hugo is a curvy little thing named 'Hewey' or some such."
Mr. Andrews asked how I was feeling, and to my surprise I blurted out an answer honestly. "Horny." I said.
"These things happen." Mr. Andrews nodded, "Teenage boys and all, what else are they going to be thinking about?" He laughed. "Don't let any of them fuck you though. That's grounds for immediate termination and revocation of the schools "turn back" policy. You'd only be in the clear if you could prove some kind of mind-control spell, but none of the students at this level should be able to manage anything as complicated as that. Hell, they shouldn't even be able to manage turning you into a chick, but Hugo's a bit of a talent."
"Yeah well I think he might've gotten in some mind control too because I can't stop thinking about-" I stopped myself before I said 'sex'. What was wrong with me that I was just saying all this outloud?
"Sex?" Mr. Andrews asked, "Yeah, no, that's not mind control. That's a spell that fucks with your impulse control. Makes you blurt out things you're thinking about too, which I guess is why you're telling me this. That wouldn't be too hard for a kid like Hugo." He shrugged, "It happens. The best course of action is just to let it all out someplace safe and the spell will burn itself out."
We locked eyes for a moment and... that is how I ended up on a desk with one leg up in the air as Mr. Andrews frantically pounding me.
"OH FUCK YES!" I moaned. Being a guy trying to get his life together and taking jobs as a substitute teacher, it was safe to say it had been a long time since I had sex. What sex I'd had... well, it didn't compare to this. My tits bounced, my pussy stretched, my world rocked. When I came I saw stars and didn't want it to end. And it didn't. Mr. Andrews just kept right on fucking me and it kept right on feeling amazing.
Mr. Andrews warned me when he was about to cum and said he wanted to cum on my tits. I was dizzy and lost in a world of strange pleasures, and it didn't seem like an unreasonable ask in the moment.
As I jerked(!) his hot cum onto my boobs the fog of my arousal finally started to lift and I was left feeling deeply, deeply satisfied.
And then I blinked and felt the cum on my boobs and the tingly soreness of my pussy and thought about what I'd just done.
"Don't worry about it." Mr. Andrews said seeing the blush appear on my cheeks, "Go with the flow. You were amazing by the way." He said as he put his pants back on.
"Uh, thanks?" I hadn't even been a woman a day and I'd fucked a man I just met that morning! His cum was all over my tits!
"Listen, you're probably going to be that way for awhile. Admin's pretty slow to fix this sort of thing. I know you're probably not under the impulse control spell anymore, but I'd love to take you out for a drink sometime. I can tell you some stories of my own so you feel less weird here - like the time a young woman got a crush on me and shrank me down and kept me in her panties until someone figured out I was missing. And if the drinks are good and my stories make you feel a bit less on your own here... well we can do this again - you seemed like you enjoyed it, and I know I did." Mr. Andrews smiled.
His cum was still all over my tits as he made his final excuses and left after asking me out. On my own I knelt there and my embarrassment started to fade. I shivered - in part from being naked and cold, but also in part from memories of how fucking incredible sex as a woman had been!
As I put my bra back on, I was sure I'd take Mr. Andrews up on his offer sooner or later. Probably sooner...