A puff of smoke, exhaled from my lungs, drifts onto the snowy city below me. Standing in my penthouse, I am a woman on top of the world. In one hand alone, I have held the lives of countless men, and with the other, brought ruin to them all.

A black widow. I don't think there's a better term to describe a woman like me, though the men in my life might prefer 'whore', or 'bitch', or 'mistress'. I wasn't always this way though.

It all began one winter night much like this one, many years ago, after my boyfriend and I got piss drunk at a party. We were on the way home, buffeted by the cold wind, when we took shelter in a convenience store. That was the night when I first laid eyes on it: XChange: The fast-acting, temporary, gender-swapping pill!

There was a whole row of the pills, in all its different incarnations. Basic, Xtra... Resistance... Denial. But what captivated me most was the package at the end of the row. XChange: Him & Hers'.

Picking up the package, I was drawn to the couple on the cover. A hunk of a man and a petite blonde on a bed in a shared look of ecstasy. The small print below them read: Spice up your sex life, try life as the other side for a night.

Looking at it then, I was enraptured. So much so that I pushed it into my boyfriend's arms and begged for him to try it.

"Please, Jake." Despite my best pout, I could see the reluctance in his glazed-over eyes. The apprehension in his arms as glanced at the blue and pink package in my hands.

I could see the imminent rejection on his lips, so I played my trump card. The words came slowly, reluctantly, from my throat, "Come on, do this and I'll let you do that thing you've always wanted..."

His eyes lit up at the sound of that. "Really?"

"Yes, really. One night on XChange and I'll let you do anal." That practically sent him running to the cashier, package in hand and the silliest grin on his face. He'd been begging me for it for weeks now.

Little did he know then of the fate those innocent little pills would send him spiralling towards.

Back in his dormitory, in the privacy of his bedroom, I pushed a little pink XChange pill into his mouth while I swallowed a blue one.

And then, I watched: As my stud of a boyfriend, the quarterback of the college football team, began to shrink before my very eyes. As little old me began to grow, arms flexing as my muscles started to expand at a miraculous pace.

In seconds, Jake was standing before me a petite woman, shyly looking away from me with arms folded over his newly formed breasts. And I, I started wearing the pants in our relationship.

I pushed him (or her?) onto the bed, inhibitions already melted to nothing by the mixture of alcohol and arousal. I realized then, as I pinned his tiny arms above his head, as I began kissing him hard and rough, that I'd never before found him as attractive as I did now.

Don't get me wrong, I'm not a lesbian. To be honest, none of the labels or sexual orientations fit a woman like me. What I was was something else instead: A woman who loved being in control.

And with a body rippling with muscle, holding down my mate as I began grinding against his helpless body, I'd never felt so good before. It felt so natural.

Jake, however, didn't take as well to it. He yelped as I kissed him, held back his moans as I started licking, teasing, at his tits. He was resolute in his desire to stay masculine, to keep in control. But I was having none of that, and I knew just the way to break him.

Tracing downwards from nape to navel with my tongue, I began teasing the thing that made clear what he was: A slut. His eyes widened, his breathing hitched, as I started licking his labia, his newly formed slit.

Soon, gasping turned to moans as I gave him a much-needed lesson on cunnilingus.

After that, it was only a matter of time before his walls melted away to nothing.

With legs spread apart and my newly-grown cock at his entrance, I made him beg for it as I rubbed the head of my eight-inch erection against his cunt.

"Tell me you want it." I snarled, relishing in every moment of control I now had.

Then came the pitiful moans and the even more pitiful attempts at bucking his hips against mine. When I held him tight, pinned helplessly against the bed, he began to relent.

"Ah, f-fuck... Fuck me... Fuck me, please!" He screamed. Music to my ears.

And like any good girlfriend, I did as I was told.

The moment of penetration was almost divine. It felt heavenly, to enter him, to deflower him. And his moans, his pain, his resistance, only served to push my pleasure to ungodly heights.

It wasn't long before I was fucking away, thrusting inside him with reckless abandon. That was when I saw it. A glimpse of something I'd never seen before: His body writhing, his palms pressed against my chest, his face scrunched up and moaning. It was the look of sheer and unbridled pleasure.

As I railed away, fucking him the way I'd always wished he'd fuck me, there was no more resistance, only whimpers and cries of ecstasy.

That was the moment I knew he was well and truly mine. And I took full advantage of it.

After that, it was easy to do whatever I wanted.

Remembering my promise to him earlier that night, a smile came to my lips. I pulled out of him, leaving him a moaning wreck desperate for more. Then, flipping him around, I began rubbing my cock against his sphincter.

I never quite understood the male desire to shove a cock up someone's arse until the moment I felt it myself. A part of me still finds it ironic that I fucked him up his before he did me.

He resisted at first, sense returning to him when he started to realise what I intended to do. But by then, it was too late. With one arm wrapped around his chest and the other rubbing his clit, I pushed inside him with a grunt, the juices of his cunt my only lube.

He ended up coming minutes later, kicking and screaming, with my cock in his arse and my fingers in his cunt. And as I felt his body spasm beneath me, I experienced my first male orgasm.

As we lay in bed in the afterglow of our experience, it dawned upon me just what was missing from our relationship.

That was the beginning of it all. The dawn of my addiction. I wanted—no, needed—more.

Of course, I wasn't alone in my exploration of XChange. As billboards and ads for the miraculous gender-swapping pill rolled out across the nation, college-aged co-eds were the market of choice for the XChange Corporation.

XChange was taking our campus by storm, so much so that it was growing to be the topic of choice between me and my friends.

"You did what to him?" Carrie did a spit-take.

"Carrie!" Jenny scowled, "You got your tea on my dress!"

"Oh shush, Jenny. Mary, tell us the whole story!"

"It's like I said, we took an XChange Him & Hers' and..." I smiled, slowly beginning to understand just why guys liked to brag about their conquests. I gave them the story in full, leaving out none of the details, much to Carrie's delight and to Jenny's constant squeamish squeals.

"God, that's so hot!" Carrie laughed, "I can't believe you fucked the quarterback of the football team. The campus's biggest alpha male!"

"Yeah, I can't quite believe it myself."

"Do you think he'll do it again?" Jenny asked softly, betraying her interest.

"I certainly hope so."

In the weeks that followed, sex with Jake proved much better than it was before. I liked to think it was because of the lessons I gave him on the female body. But I knew the truth: He was eager to show me again who's the boss in the relationship. Who wielded the cock.

Convincing Jake to take the pill again was a near-impossible task. He wasn't eager to go back to being the petite little thing he was under the pill, completely at my mercy.

It wasn't easy to convince him to take the pill, but god did I love it when he caved. The nights we'd spend with roles reversed. With me pile-driving him, fucking him doggy, missionary and who knows what else. Making him scream my name.

I'm not sure what I found more arousing: The way his face twisted up in this perfect mixture of pleasure and apprehension. Or the fact that I was fucking the college quarterback, the alpha male everybody knew, up the arse.

It certainly gave new meaning to the way I groped his bottom after a match.

But despite the fun we were having, he'd be back to regretful and masculine old him the next morning, pretending that nothing had happened. Worse, it became harder and harder to convince him to pop the pill. Losing his masculinity was making him hold tighter to it.

And after tasting what it was like to be in control, dating the biggest man on campus started to take its toll. His endless need for dominance, his constant desire to fuck, I was getting bored of it.

With those rare nights of ecstasy getting fewer and fewer, I began contemplating something insidious.

Every time I went to the convenience store to pick up XChange (Jake was always too ashamed to do it sober), I could never help exploring the different brands of XChange. Gosh, there were so many. It seemed as though the XChange Corporation had no end to their creativity. Or their limits.

The one brand that my eyes always lingered on was Resistance. It was a unique brand of XChange that worked just the same as Basic in nearly every way, save one. While It lasts a single night (or six hours) and offers a seamless female experience, it offers a chance of permanency, with a twist.

Every orgasm experienced while under XChange Resistance increases your chances of becoming female. Have enough and the transformation becomes irreversibly permanent, and the taker becomes female in every way.

Picking up the package for the first time, dark thoughts began racing through my head. Would Jake change back if he used Resistance? What would happen if he didn't? Could I even convince him to take it? ...What if I didn't need to?

"I think you should do it." Carrie said, with Jenny nodding in agreement. We were sipping our lattes on the bleachers, while our boyfriends were having football practice out in the field.

"After all, if he's truly man enough..." Carrie gazed at her boyfriend as he did a pass. "He'll change back, right? That is the point of Resistance."

"But... What if he doesn't change back? He'd be ruined." I asked, a strange thrill running through me at the mere thought of it.

Carrie's eyes twinkled at that. "Oh, Mary. You're looking at it the wrong way. Think of the pill as a... a man test. If he he doesn't enjoy being a woman, he wouldn't fail. But if he does, then clearly he's meant to be one!"

Jenny nodded. "Yeah. In a way, you'd be doing him a favor if he becomes a woman from it."

In the distance, I could see Jake on the field, his herculean physique towering over the rest of his peers. Could I really rob him of the masculinity that defined him so?

"Do it, Mary. You won't regret it." Carrie said, as though reading the question on my mind. Then, with a smile, "In other news, Don and I have started experimenting with XChange."

"Really?" Jenny said, eyes widening in disbelief. Her eyes shot out to Carrie's boyfriend out on the football field.

"Really?" I echoed, following her gaze. Don was easily one of the biggest guys out there. With tatts covering every inch of his arms and enough brawn to put a bodybuilder to shame, Don was the last man I'd have expected to use XChange.

"Yes!" Carrie laughed, jubilant. "And you won't believe how cute he looks with XChange!"

Pulling her phone from her pocket, she brought up a photo of a naked brunette with arms folded over his D-cup breasts and the tell-tale tribal tattoos on her arms.

"Oh my god, it's really him! How did you convince him to do it?" Jenny snatched the phone from Carrie's hands.

"I slipped it into his drink." Carrie answered, as Jenny began flipping through her images of Don.

"Isn't that... date-rape?" came Jenny's incredulous reply.

"Don't be silly, you can't rape a man. They always want sex." Carrie said, "And besides, he couldn't get enough of it after."

Carrie's phone gallery was practically a porno, which Jenny couldn't get enough of. With Don in various explicit positions, one after another.

"Gosh..." Jenny mumbled, "How do you guys manage to do this? Ben won't even entertain the thought of XChange."

"The key, Jenny, is not to even give him a chance to say no!" Carrie laughed.

The last image of Don had him looking up into the camera, eyes glazed over with lust as his tongue licked the tip of (presumably) Carrie's cock. Enthralled, I knew then I had the answer to my conundrum.

A few nights later, I invited Jake to my apartment for drinks.

Once he'd gotten inebriated enough and excused himself to the bathroom, I laced his cup with Resistance.

When he came back, he drank it so innocently, completely unaware of what I had in store for him. Drunk, he didn't even notice his body beginning to change back into its petite and sexy XChanged-form.

Taking him by surprise, I wrestled him onto my bed. He was still laughing playfully as I tied his arms and legs to my bedpost with leather restraints. It was only when I brought out the strap-on from my drawer that he began to realise what was going on.

By then however, it was already too late.

In his female form, he could only buck and struggle uselessly against his restraints as I started putting on my strap-on. His eyes widened at the sight of it in my arms, a good two-inches larger than my cock under the blue XChange pill.

As I traced my fingers down his squirming body, I could feel the wetness of his cunt. "Well, what do we have here?"

Scissoring my fingers against his wet entrance, I couldn't help but smile. "Looks like Carrie was right after all. Men do always want it."

His whimpering moans were all the encouragement I needed to climb atop him and enter him with my strap-on.

Getting fucked by a man was shameful enough for an alpha male like Jake. But getting fucked by a girl? I think it wreaked even greater havoc on his male psyche, because he struggled harder than he ever did against me.

Nevertheless, his grunts and groans of resistance soon turned to whimpers and moans of pleasure as I thrust away inside him, spearing his cunt with my strap-on.

The fact that he didn't know the risk of permanency made me wetter than I'd ever been in my whole life.

And when he came, his whole body twisting and writhing in the throes of pleasure, I couldn't help but orgasm too, the sensation of the strap-on rubbing against me too much to handle.

Once was far from enough for me, however. Drunk on the control I had over him, on the way power had so easily changed hands between us, my mind was set on a singular resolution for the night: Permanency.

I must have fucked him until my hips had grown sore from thrusting. On my strap-on alone, he came three times, screaming my name in each.

After that, I started using my toys on him. Spreading him open with my dildos and plugs, making him moan and scream from the ecstasy of release.

In the end, I left him tied up at the foot of my bed, legs spread wide with a dildo right beneath him. I fell asleep to the sound of him fucking himself on it, his moans the best lullaby I have ever heard.

By morning, he had become a numb and broken mess, barely conscious as his hips continued to thrust against the dildo out of habit.

I untied him and let him sleep, noting with a mixture of glee and dread that he wasn't changing back. It was hours more before consciousness, and sense, returned to him.

And when it did, it returned in a most spectacular way.

Jake was screaming, shouting, confused and panicked when he realised the transformation hadn't ended. He'd seen enough of the XChange warnings and advisories around campus to know what it meant for him.

My heart was racing as I tried to calm him down. I held him tight, comforting him and betraying nothing of the sheer ecstasy I was feeling inside. The unimaginable pleasure I felt from the knowledge that I had robbed him of his masculinity, for good.

"I'm not sure what happened, babe. I got the same pills I normally did..." I lied, and he believed me.

I drove him down to the clinic myself.

He was squirming in his seat the whole way, unused to having his female body anywhere but the bedroom.

At the clinic, the nurses took his blood as the doctor quizzed him on his sexual history. Questions on whether he'd ever had sex with men, whether he'd ever expressed an interest in them, whether he'd ever been curious about being a woman.

Jake answered no to all of them, his discomfort visibly growing each time he had to assert his now-gone masculinity.

Looking at the results of the blood test, the Doctor gave him a skeptical look. "Well, I'm not sure if I can believe you, Jake, because it seems you've taken an XChange Resistance. Your blood reads at an extremely high rate of estrogen.

"What?" was all Jake could manage.

"That's indicative of someone who far exceeded the number of orgasms necessary to cause a permanent change from Resistance. You're a woman now, Jake."

"But you can change me back, right?" He asked, a desperate look in his eyes.

"I'm sorry, Jake, but I can't. The transformation is irreversible," The Doctor said, "and such a shame too, you had such promise as a quarterback. Should've read that label more clearly before you take the pill."

"I-I didn't even know..." He was devastated.

I'm sure you'll consider me a sadist, especially once I confess how I relished the look on his face once it truly dawned upon him that he would never be a man again.

And my joy only grew greater when Jake's shock turned to sorrow and tears, a moment of feminine vulnerability I took full advantage of.

"Oh Jake, I'm so sorry." Gathering him up in my arms, I began apologising. "I didn't know.. I must have taken the wrong pill. Everything's going to be okay, I'll always be with you. I promise."

And thus began Jake's new life as Jacqueline, and the start of my own flirtation with a most sinister path.