My Sister's Girlfriend

The twins were six months old when I walked in on Jan and John unexpectedly, and things in our relationship changed forever. Well they would, the father of my children was fucking his Sister and my "Husband".

I'd been off sex since the birth so wasn't surprised that Jan was frustrated, but I had started to feel sexy again recently, and in fact had just got a new outfit that I was going to seduce Jan in that night. I'd left the twins with Jans parents for a couple of hours. Since the birth, they had come round and finally accepted Jan and me as a couple. The seduction didn't happen as I planned.

As I opened the door to our bedroom I heard Jan moaning and groaning, Oh good she's in the mood, playing with herself again, she's always liked that," I thought; she's always had a high sex drive. Then the door opened fully and there was Jan facing me, the thing is she was impaled on Johns cock, not only was she impaled on his cock, it was deep in her arse. She was riding him reverse cowgirl style, John couldn't have been any deeper up her arse, as I continued to look I could see her pussy glistening and dripping her juices over Johns balls.

John had one hand playing with her boobs, his other hand supported her back as she leaned back towards him. Jans' hand was playing with her pussy, she'd got one finger stroking her clit and another just inside her lips.

"WHAT THE FUCK IS GOING ON!" I screamed at them.

"I'm fucking my Brother," Jan said, "and it's so fucking good."

What could I do? I was devastated, and shocked to my core, I knew that Jan had always had a desire for John, which was confirmed when I heard her offer him sex with her when we had put on a girl on girl show for him. I don't think she knew I had heard her. Nor that she'd really meant it, I was sure it was just in a moment of passion

Sure, John and I had had sex, but that was with the intention of getting me pregnant, the sex had been ok and I went along with it so that I could have a child, but I am a lesbian and I thought Jan was as well. I knew she had been with men before she came out, but I thought she was over them now.

John looked at me and smiled but didn't stop fucking Jan up the arse, and I have to say it looked sexy, my Husband and her Brother having sex.

"I'm so sorry Jill, we didn't want you to find out like this," said Jan.

"How did you want me to find out. And how long has this been going on?" I demanded.

"We just didn't know how to tell you, we've been like this since the day after the twins were born, it just happened."

"Just happened, what the fuck do you mean it just happened?" I shouted at them.

Just then John moaned, "I'm cumming."

"No your not, I want to watch you fuck her arse some more. You're not cumming until I tell you-you can, I know you can hold back if you want to," I said.

Jan looked shocked.

"I can't take much more, I'm so stretched and sore," she cried.

"You'll have to otherwise this marriage is over," I told her. "You seem to like John fucking your arse without letting me know, so let's see how good you are at it while I watch. The divorce court will love the descriptions I'll give them if you don't!"

I was hurt they had betrayed me. I wanted to make them suffer. Jan especially and in a physical way.

I don't know how John managed to hold himself back, but he did and managed to fuck Jans arse for another ten minutes. At last, I felt Jan had suffered enough, for the time being, also watching the two of them together had got me feeling randy, well I had been ready to make love with Jan that night anyway.

"Ok finish off you two, but in her arse," I instructed them.

A look of relief came over Jan, I'm sure her arse was on fire, as John has a seven-inch cock.

John, pushed faster into Jan and a glazed look appeared in his eyes as he shot his load in his Sisters arse. As he did Jan leaned forward and screamed as her orgasm hit her. Before either had finished properly I told Jan to get on her knees and clean Johns cock with her mouth. Reluctantly she did as she was told.

When they were finished I said, "Well where do we go from here. Jan why are you fucking your Brother?"

"I've always wanted to, I love you Jill, but I've wanted John since we were teenagers, possibly even before.

"I don't want to lose you Jill but if what has happened is too much for you, then it's my mistake and if we have to split up, that's a consequence I'll have to face," said Jan with tears running down her face.

John was just sitting on the bed his face ashen with shock and looking as guilty as hell. Well, he had just been caught in an incestuous position with his twin sister.

"Jill, I'm so, so sorry, neither of us wanted to hurt you. Sometimes things happen for no reason. We just didn't know how to tell you what we have been doing," said John. "I've fucked up this relationship between all three of us."

My mind was in turmoil over what I had discovered, but strangely it was the fact that they hadn't told me more than the physical act of them have sex together that disturbed me the most.

I'd known Jan had wanted John for ages, long before she had told him she was ok if he wanted to have sex with her, when she "claimed" me back from him, just after I got pregnant. She didn't know she used to talk in her sleep, saying things like, "John I want you, I want you to make love to your Sister. John, please fuck me hard, no harder."

"Jan, I don't want to split up, I love you too much, and we have the twins to think of. I'm not sure I can forgive either you or John, but we need to work things out between us, and there must be no more secrets. Do you still want John"'

"Yes."

"As well as me, or instead of?" I asked her dreading the answer she may give.

"As well as you, I may be greedy but I want you both. I love you both deeply."

"Right I need to think, John, fuck off home. I'll let you know when I have made my mind up on what we are going to do. Jan, you're sleeping in the spare room from now on again until I decide what to do."

This was the second time John had been told to leave Jan and me alone while his sexual fate was decided. He stood up and left without saying a word, but looked back sheepishly as if to say sorry. Jan came towards me to try and hug me, but I pushed her away, turned on my heel and went into our bedroom fell on the bed and burst into a flood of tears, devastated at the betrayal I had just witnessed.

Two days later Jan was still banished to the spare room when I phoned John and told him to come to the flat that night. I also told Jan he would be coming round I had made my decision. When she got home from work I gave her instructions on what she had to do when John arrived, then I went into my bedroom and got ready.

The doorbell rang at seven-thirty and Jan answered it, taking John into the lounge and gave him a drink as instructed, then I joined them.

"Right you two, I've made my mind up on this situation you have put me in, now listen and no interruptions," I told them.

"I've decided that you two can still see each other if you want, I don't think I can really stop it but it has to be under my conditions:-

1: I know every-time you are together.

2: Jan, you are not to get pregnant, no way so sort out birth control. NOW!

3: You use the spare room if you are doing it here, you're not using my marital bed.

4: John, if you want to sleep all night with Jan, then you do that here, in the spare room, she's not staying overnight at yours.

5: No one else is involved but you two, male or female.

Now, do you agree, if not then you have a decision to make?"

"Jill, I'll agree to anything you want. I don't want to hurt you any more than I already have," said John.

"Jill, I love you so much, I'm willing to give John up. It was my mistake."

"Jan, it can't be a mistake if you've done it and wanted it for so long. I've told you, I'm ok with you and John fucking, but on my terms. I know it means a lot to you, this is my way of dealing with the situation and still staying married to you. I'm not happy but can live with it, just like you lived with John having sex with me."

"OK," Jan replied sheepishly.

"And no one must get to know. You two could technically go to jail, incest is still illegal in England."

"We know," they both said.

"Now what do we do," asked John. "What are we doing for the rest of the night, where are the twins?"

"With my parents, and the rest of the night is up to you two but first I want to watch you fucking Jan, here and now, and I mean fucking her hard as she had you do to me." Jan had never really liked John and me making love, so when she had watched us, she had insisted that it was hard, not tender.

"What?" from John.

"John, think about it, you've watched me and Jan, and Jan has watched you and me, so now it's time for me to watch the live sex show. Or don't you want her?"

Jan stood up and before she walked over to John came over to me and said, "Thank you I love you so much." She looked so sexy in the short, red leather mini skirt I had made her wear, and tight white T-shirt, that clung to her body, it was clear that she didn't have a bra on, her nipples were aroused and pointing out through the thin cotton fabric. Her brown hair was up in a ponytail and swayed in time to her hips as she sashayed towards John.

Jan normally wears skirts that are cut just above the knee or mid-thigh at best, I like the way she looks in that length of skirt, more demure, even though she has great, slim, sexy legs. I prefer that not all her legs are on show, it's sexier that more is left to my imagination. Sure she has a couple of short skirts that I love to see her in, a very short denim one (hasn't every girl got a short denim skirt?), and a classic black leather one, plus loads of short shorts. This red one was a new skirt I had bought her for tonight.

"Well Bro, let's put on a sex show for Jill, as she asked for. That's if you're up for it?"

You could tell John was up for it from the bulge in his jeans!

Jan took hold of Johns' hand and pulled him up from the couch and into a very warm and loving embrace, bending his head to hers so that that they were face to face and I saw her tongue protrude from her lips and force its way into his mouth as she kissed him. In a long, slow but passionate and sexy kiss.

Johns' hands were going wild all over Jans body, caressing her boobs, grabbing her arse, going up her skirt, never stopping for a moment.

I was jealous of him kissing and touching her and still not comfortable with it, but I have to admit, they looked sexy together, and I was getting turned on by the sight.

Jan broke off from kissing John, looked at me and again said. "Jill thank you, thank you so much. I love you."

John had taken that moment to pull Jans top over her head and expose her boobs, which he then began to play with it in earnest, pawing one and tweaking the nipple, whilst sucking on the other, then switching sides. It's a thing he does well, he did it with me to good effect a few times!

Jan in the meantime had undone his jeans and slipped them down past his hips to the ground and had her hand inside his boxers, clearly playing with his stiff, seven-inch cock.

"OOOOOH," from John as she did.

John slipped to his knees, kissing down Jans body all the time he did so, kissing and licking, when he was on his knees face level with her belly, she reached behind her undid the zipper on her skirt and let it fall away to the ground, leaving her in a pair of black transparent panties. John buried his head into her groin. Licking her sex outside her panties.

God I was getting turned on, my nipples were so hard and my cunt was getting wet, I wanted part of this action, but not yet I told myself. Hold back, keep control!

John ripped the panties from Jans body and really got to work on her pussy with his mouth, tongue deep inside her as he licked her from bottom to top, time after time, pausing occasionally to flick her clit with his tongue, or to take it in his lips. Jan was going crazy with this action grinding her hips into Johns' face and holding his head close to her. Then with his tongue buried deep into her pussy, she pulled his head in hard to her held it there and with a long slow moan, shuddered and came, even from where I was sat I could see her juices flood into his mouth and run down his chin. Jan was always been like that when she comes, my face is always sticky with her cum when I've licked her to a climax.

Jan pushed John onto his back on the floor, got his boxers off and sank her dripping pussy fully balls deep in one easy movement onto his erect cock, reverse cowgirl position so that she was facing me, looking deeply into my eyes, as I watched her fuck her Brother in her cunt for the first time.

"Jill, thank you so much again, I love you and only you,' she said. 'I'm just fucking John for the sex."

"No you love him as well, it's just different."

For the second time in a sex session, John was there simply to make up the numbers, even though this time the sex was happening between him and Jan, all the emotion, love, pain, betrayal and now forgiveness were going on between Jan and me.

They looked so hot and sexy there with Jan bouncing on Johns cock her tits moving in-time as he thrust into her, she was slamming herself down as hard onto Johns cock as she could. She was obeying my command that they fuck hard not make love. I could see her pussy was still leaking her juices, oh how I wanted to taste them.

Jans actions and obvious clamping of her pussy muscles on Johns cock had got him to the point of no return as he grabbed and squeezed Jans tits so hard he came. He came hard thrusting his hips up into Jan as he shot loads of cum into her, I could see his balls emptying, well at least I think I could.

That was it, I'd seen enough I went over to them pushed Jan off Johns cock and sank my face deep into her pussy determined to lick up as much of Johns cum as I could out of her pussy. When I had as much as I thought I could get I pulled away and then kissed her making sure that we shared Johns cum, passing it from one mouth to the other until we had both swallowed it all, then I turned round and licked Johns soft cock clean, this time I got the taste of both him and Jan.

"John, I said you and Jan could fuck tonight but I want you now, then the rest of the night is yours and Jans. Then in the morning, we do a three-way, and you both are going to make love to me."

Jan gasped at this as she played with Johns hardening cock, and both of them were soon playing with me, teasing and tantalising me, all the time playing with my tits, I'd lost my clothes earlier as I watched them fucking.

It didn't take John long to get his erection back and when it was ready I got onto all fours and told him to, "fuck me doggy, you know we like that."

John got behind me and I could feel Jan hold his cock in position at the entrance to my pussy, as soon as he was in position he slammed his stiff cock deep into me, deep and hard, oh how I wanted that just then.

There was no finesse, John hammered into me and I thrust back at him as hard as I could. We were fucking. Jan somehow had got herself under me so that her face was at my pussy and began to lick my clit as John pounded into me, her pussy was directly in front of me so I did the natural thing for me and began eating her out.

This was supposed to be John and me, but I was ok with a brief threesome, but it was me that was going to cum, I didn't care about either of them. Jans tongue on my clit and Johns cock pounding into my pussy soon had me on the brink of cumming and when John slapped my arse and pushed a finger in it BANG I came like a train. I screamed so long and loud, if the twins were in the flat I would have woken them up.

"FUCK, FUCK, FUCK, YES, OH GOD YES," I screamed as my orgasm coursed through my body. It had been over seven months since I had had one, what with pregnancy and then the birth.

When I'd come down from my release Jan and John were lying beside me dumbfounded at the intensity of my orgasm. I kissed both lovingly on the lips, got up, went into the spare bedroom, saying to them, "Sleep in the main bedroom, for tonight only."

I dropped onto the bed and burst into tears of emotion, betrayed, happy, sad, both, I don't know, I only knew the relationship between the three of us was now changed irreversibly.

I spent a restless night, thoughts whirling in my head, as I listened to them make love together, time and time again.

I'd had sex with John, and it was ok, to be fair John was a good lover, but I am a lesbian, I've never wanted to be with a man, my sole intention of fucking John was to get pregnant and that had worked to everyone's joy.

When John fucked me it was different to Jan using a strap-on, it seemed more "natural" but did I want a cock deep in me, Jan used a different style to John, more loving. Did I want to be part of a three-way relationship or did I just let John and Jan get on with it on their own?

I fell asleep still wondering. Next morning I'm awakened by a soft stroking of my right cheek and Jan whispering in my ear, "Wake up baby, I love you."

As I sat up I saw that John was with her and both were naked, Jan looked so good, beautiful and sexy, John is naturally a handsome man and I couldn't help but notice his cock was at half mast and wouldn't need much attention to get it fully erect. They had brought me a cup of tea and some juice.

Jan said, "Jill when you've finished that we want you to join us next door, we both want to make love with you.

"Please, please come and join us," she then begged. "We'll do anything you want."

At first, my mind said no, but looking at her and the way she seemed so desperate for me to join them in a three-some made me reluctantly change my mind.

"O.k." I said, "but I want to make love to you both, not fuck or have sex, I want it soft, and loving, and gentle. I know John can be that way, but Jan, will you let him be that way with me?"

"Yes, she will," said John as he took hold of my hand, pulled me up from the bed, took my naked body in his arms and laid the gentlest of kisses on my lips. As I slid into his arms, his cock stiffened against my belly. Jan moaned at the sight. Breaking the kiss I took hold of both of their hands and led them to the main bedroom.

When we got into the bedroom they had changed the sheets from those they had made love on last night and the air was scented, the curtains drawn and the lighting low, and this was in the morning of an English spring.

"We wanted this to be special for you," Jan said, "John's done all this."

I turned to John and gave him the most sensitive and loving kiss I could, then turned and did the same to Jan. I was stood between the two of them and they both started to kiss me and caress my body, which was trembling with anticipation and apprehension about what was to come. Jan moved her head to lick and play with my boobs, taking the nipples in her mouth and nipping them teasingly with her teeth, as John alternated between kissing my lips and nibbling my ear. God how I love that.

Jan was still teasing my boobs as I dropped my hand to Johns crotch and got hold of his erect seven-inch cock and began to stroke it from tip to base using the softest of touches. John moaned as his hand reciprocated my action and got one finger into the outer lips of my pussy and matching his rhythm to mine ran his finger up and down my slit. Now it was my turn to moan.

Jan dropped to her knees in front of me and whilst John changed to rubbing my clit she licked my pussy from top to bottom. Oh! The feeling that was washing over me, it had totally replaced my other feelings of apprehension, and the anticipation was building.

Jan pushed me and I fell onto the bed, John joined me there, kissing and playing with my clit, as Jan stayed on her knees licking me out, but now she was harder and quicker. I wanted to cum like that, to surrender to my body and go with the flow, Jan tried to break off from licking me, but I held her head in place to stop her and she got the message, as she knew my desires so well.