I wasn't expecting a three-some that night. In fact I wasn't even expecting a two-some. My hope was to get well and truly slaughtered on cocktails and my friend and I had achieved this objective to the best of our abilities. The last thing on my mind was to end up in bed with a total stranger and a professional dominatrix, and yet a few hours later, that was where I found myself.

F and I had been out celebrating something or another in an almost empty bar. It had got to that point of the evening where both of us were wobbling unsteadily, giggling madly and talking nonsense. We ended up discussing my sex life and the frustrated lack of adventure within it: there I was, with an experimental mind and eager to try out new things, and yet I still hadn't had a threesome. I was gutted about it to say the least - surely everyone had had a threesome by this point in life?

So I'm moaning about it, and F asks me what I think of this guy at the end of the bar. Through my cocktail tainted shades he seemed alright, and I responded to F, with a drunken, "yeah, I would". She grinned at me, and (being a generous sort of girl) asked me whether I wanted her to pull him for me. I was a little confused; I mean, if I wanted to shag him, I could have asked him myself: I wasn't sure why she was offering to initiate the process so I questioned her. She looked at me, with a glint in her eye, and said that I was going to have a threesome tonight, and that she was going to invite him to join her and I.

Now F was my friend - we weren't lovers. Nor was I interested in being sexually involved with her. It wasn't that she was unattractive (the opposite), nor that she wasn't sexy to me (again, she was), but I have a little rule that I like to stick to, which is not to fuck my friends.

I have learned the hard way, that at best, shagging your mates always results in some kind of confusion and complications. At worst, someone gets hurt or feels too uncomfortable to continue the friendship. This results in having one less friend in one's life - a sad sacrifice to make for a night (or nights) of passion.

Real life is not like a porn movie, where two female best friends make out and then suck and fuck a man together until everyone has wonderful orgasms. Real life is embarrassment and nervousness and insecurity and waking up the next morning and realising your friendship may never be the same again. Real life is losing your best friend of more than a decade because you got drunk together and fooled around. Real life is where you are nervous being alone together even though you've spent your childhood sharing a bed with this person. Real life is where you're not sure whether your friend is looking at you because they want to rip your clothes off, or because they think that skirt doesn't suit you. Real life is about making sure boundaries don't get crossed and keeping sex and friendship separate.

So it was with some hesitation that I responded to F's suggestion that we have a threesome together. But she assured me that it wasn't some unrequited love she had for me (phew - been there, fucked that friendship up), that it wasn't because she had been fantasising about being with me and was dying to get in my pants (thank god - again, been there, lost that friend); no, she was offering to have a threesome out of charity to me: being well practiced in these matters, she was going to show me the ropes and allow me to finally tick this particular sexual act off my list; it didn't need to mean anything and she didn't fancy me, she was just offering to help me out (nice friend that she is).

And being drunk, I said, "yeah, whatever" and left F to work her magic with the Stranger. Not many people say 'no' to F; she is the most assertive woman I know, plus her personality is so magnetic that even if you found her point of view to be most disagreeable, you soon find yourself agreeing with her, just because she leaves you no other option. Which was what happened to the Stranger: he never stood a chance saying 'no' to F (and neither did I). One might argue that 'what kind of man turns down the possibility of having sex with two women when offered?' and to some extent I agree. But faced with the ballsy sexually aggressive F, and the upfront cheekiness of me, I would not have been surprised if the Stranger had turned us down: even I found us both to be intimidating. To his credit though, he said yes, and a while later I found myself in his bedroom with F, stripping off his clothes.

So the Stranger is standing there naked, looking at F and I, somewhat cautious. I wasn't quite sure what to do. Is there some kind of etiquette I should know about: who goes first; who touches whom where, who is the 'toucher' and who is the 'touchee'? Aargh, I suddenly felt very muddled. But F brought me back in to the reality: she had a game plan about how it was going to work - she suddenly became Mistress F - and the Stranger and I were going to follow all her orders, or else.

When F first started spanking the Stranger's naked arse, I thought it was just a little bit of fun. It wasn't until she bent me over the bed and spanked me too, that I realised she was being serious. F had gone into 'work' mode and the Stranger and I were going to be her 'slaves' for the evening.

I have to say I didn't expect this, and it terrified me. Not only was I trying to get my drunken head around the fact that I was in a room about to have sex with two other people, and these people consisted of a close friend and a total stranger, but also, I was about to have my first experience in the submissive role of BDSM. Gulp. My heart pounded. I was very nervous; I had seen F at work and she scared the hell out of me: now I was about to experience her skills firsthand.

So, F tells me to get undressed and lie on the bed. I take off all my clothes except my bra and panties and lie down. I don't do it quick enough: it warrants a quick sharp snap on my arse from F. Ouch, it hurts. But the sting feels good somehow. I feel my arse cheeks tingling and lie on my front. Obviously this is not to F's satisfaction: she snaps against my arse again, but this time I feel something crack and the pain seems more direct, more focused. I turn my head and see that she now has the Stranger's belt in her hands and it is still swinging from being whipped against my poor bottom. The pain in my backside changes from an intensely sharp sting to a warm soothing throb. I rub where the pain is and it feels sensitive to my hand, the skin tingling as I caress it. Nice.

F crawls up onto the bed with me and whispers in my ear, "Are you ok, do you want to play like this?" I look at her, my friend, and know that I can trust her. I reply "yes" and that is the last F/Girl conversation we have with each other until the whole episode is over.

F turns me over and grabs both of my hands above my head. In a matter of seconds she has them both expertly tied together with the belt, and strapped to the bed. My wrists hurt and I grimace slightly at the pain. This warrants a quick slap to my face, the Stranger's t-shirt stuffed in my mouth as a 'gag' and the pulling apart of my legs.

Before I knew it, F had removed my panties and my bra and was hovering over me grinning. She pulled off her own top and bra and sat on my stomach so I could barely breathe.

"Are you a good girl?" she asked me.

I nodded. She slapped my face.

"I said are you a good little girl?"

I nodded enthusiastically, scared of what F might do next.

She said to me, "Good little girls don't make a noise when I do this", and then she grabbed my nipples so hard I thought I would scream. But I just bit down on my gag and tried to endure, thinking to myself that it would all be worth it.

F moved down my body and knelt between my legs.

"Spread them" she said, and I opened my legs as far as they would go.

"Mmm, nice pussy", she remarked, "good girl, you keep it nice and trimmed" and she pressed her fingers against my labia.

I wondered if she was going to do something painful to me and I flinched as she stuck her fingers inside me.

"Good, you're nice and wet" she said and removed her fingers, "Come here, Slave" she then called across to the Stranger.

Now, all this time the Stranger was just watching, whilst busily stroking his cock, probably thinking he was going to stand on the sidelines and get some girl-on-girl action. He hadn't reckoned on F though, and her plans.

"I said come here Slave. Now." F stood up and walked over to the Stranger. "Bend over you little slut" and he did as he was asked. F whacked him so hard even I could feel his pain: my spanks were nothing in comparison to what the Stranger was getting from F. She carried on spanking him for a while and when she felt he was becoming too vocal with the pain, she slid a hand between his thighs, gripped his testicles hard, and whispered in his ear,

"You little piece of shit, you don't make a fucking sound unless I tell you to, you don't move unless I tell you to, you do everything I tell you to. Do you understand?"

The Stranger nodded.

"And you call me Mistress, got that?"

He nodded again.

"Right, now you're going to go over there, lie between Girl's legs and eat her pussy until I tell you to stop. Do you understand?"

He nodded once more.

"And don't even think for a minute about letting this get soft" - she gripped his cock tightly - "We'll be using this shortly, I want it hard all the time. Got that?"

The Stranger had no choice but to nod - she had him by the balls. When F let him go, he got onto the bed with me and ate my pussy so hungrily it was as if there was a pussy shortage and he had just been given a years ration all at once. [It was only later that he admitted to me that he had fantasised about being 'forced' to eat pussy, and that we had realised his dream for him. It also turned out that he was most definitely a sub and that this wasn't the first time he had been with a dominatrix (F can spot a sub a mile off)].

So the Stranger has his head between my legs, whilst getting occasional slaps on his arse from F. Then she moved over to me and removed the gag from my mouth, replacing it with her breasts, which she stuffed forcefully into my mouth. It was strangely un-erotic - not that I dislike sucking on some nice breasts (far from it, especially large ones like hers) - but having F's in my mouth just felt odd. And I think it did to her too; she removed them after a brief period and resumed hard slaps on the Strangers arse instead.

After awhile, F grabbed the Stranger and pulled him up over me, so that his cock was parallel with my mouth. She bent over to me and grabbed my face hard.

"You're gonna suck his cock now, like a good little girl. Do as I say and I won't punish you".

I nodded meekly. The Stranger looked very excited at the prospect of some oral action and began to move towards me.

F almost ripped the guys arm out of his socket and dragged him backwards.

"I didn't give you permission to move did I? No. You'll start when I say. And don't even think about coming yet, I don't want to see any spunk on your cock, do you understand?"

The Stranger nodded nervously once more.

F grabbed hold of his cock and pulled him by it until his cock was pressing into my cheek. She gently wiped it against my face and across my lips, and then slowly slid it into my mouth, before standing back and alternating between spanking the Stranger on his arse and slapping me on my face.

I was choking a little; it was only natural, sucking hard on a cock stuffed into my mouth whilst I was lying on my back. But it wasn't displeasurable. I felt trapped and yet free. Scared and yet safe. Simultaneously freaked out with what I was doing and yet amazed and delighted at the same time.

I was tied up, unable to move, gagging on a mouthful of cock, and yet I felt unbelievably horny. It was the weirdest feeling to be so passive, and yet still be able to pleasure someone else. To be able to be active in doing, without being 'on top' - literally. For the first time, I felt like I understood what it must feel like to be able to allow yourself to be there for someone else's pleasure, and yet derive so much pleasure from that act itself: I realised that I liked it. And I also realised that this night was not about my having a threesome for the first time. It was about my discovering the pleasures of being submissive and that had been F's plan all along.

So when F pulled the Stranger's cock out of my mouth and shoved in into my pussy and 'made' the Stranger fuck me, I laid back and let myself become part of the surroundings, part of her, part of him. I didn't think about whether or how it was getting me off, I wasn't bothered by who, what or when an orgasm was going to happen: I was focussed on the calmness of my mind, the physical freedom that I felt and the pulses of energy that were surging through my body. I don't know whether I climaxed or not. I was too drunk and too far gone to care: my whole body felt like one big climax and the sheer power of what was taking place in that room was enough for me.

When it was all over, F and I left the Stranger to sleep and we went to have a good old English fry up breakfast in a greasy spoon cafe. We laughed about what had happened and I thanked her. It had taken me a while to realise that she had set the whole thing up to be pleasurable for me, that she wanted me to know what being with a woman was like within the confines of a safe friendship, and that since the Dungeon session, she had been wanting me to experience submission. That night I had discovered what those things were like. Plus I learned that I loved to be submissive, that it wasn't something to be ashamed of and that a little light playing never hurt anyone.

Well, my arse hurt for a few days, but it was worth it...