I was totally taken aback by what my mum had just said to me. She’d just confessed that she had just offered me up to her twin sister, my Aunty Sue, to have sex with whilst she listened over the telephone. And that she did this regularly when she sent my dad over to 'look after' her.

The worst bit though, was that during my sex session with Aunty Sue, I had actually called out my mum’s name and Aunty Sue had played on this and encouraged me to call out her name even more, and of course mum had heard every word.

“I really must have that shower now, mum,” I said to her, trying to avoid the subject any further.

She looked a bit disappointed that I hadn’t answered her question when she asked if I really had wished it had been her that I was fucking.

I went upstairs with all sorts of crazy thoughts, confusing thoughts even, running through my head. Had I really just fucked my very sexy and very dirty Aunty Sue whilst at the same time pretending that it was mum? Did mum get turned on listening to us over the phone, allowing herself to become wet thinking of her son’s cock in her sister’s mouth, pussy and arse but wishing it was inside her instead? Did mum play with herself listening in?

And what about her letting my dad go and fuck her?

I went into my bedroom to get some clean boxers and a change of T shirt. I was luckier than most of my mates as, being an only child, I had a large bedroom complete with double-bed, mirrored wardrobes, my own plasma TV and a Playstation, and it was at the opposite end of the landing to mum and dad’s bedroom, so I could watch porn on my iPad at night without them hearing.

Picking up a change of clothes, I walked into the bathroom. After stripping off, I took the lid off the laundry basket to place my dirty clothes in, and there, right on top of the pile was a pair of my mum’s worn black panties. She often left her worn panties on top of the pile rather than hiding them away.

I picked them up and sniffed them. I smelt that familiar, musty smell where her pussy had rubbed against the material. I often smelt my mum’s discarded panties.

Instinctively my cock grew as I carried on inhaling the mixed aroma of pussy and wee on mum’s panties. Instinctively, I wrapped them around my cock and started to wank it. After a few minutes, and not for the first time, I came into my mum’s panties. Long thick streams of cum landing across the lacy fabric.

Once finished, I placed the panties back into the laundry basket and then I had that long awaited shower.

Once showered, I put on a fresh pair of white cotton boxers and carried a baggy T shirt in my hands as I walked out of the bathroom. As I opened the door, mum was outside waiting. 

“I need to shower as well,” she said. “I’m all hot and sticky, if you know what I mean, and I need to cool myself down.” 

I went into my room and lied on my bed wearing just my boxers. Eyes closed, I allowed my thoughts to wander back to Aunty Sue and the events of the evening. The more I thought about Aunty Sue sucking my cock, taking my cock up her pussy and then coming up her arse, the stiffer my cock became again.

Suddenly I was conscious that I wasn’t alone and upon opening my eyes, I looked up and I saw my mum was standing by my bed. She was wearing a silk gown that barely covered the white cotton panties she was so clearly wearing. It was equally clear that she wasn’t wearing a bra as I could see through the opening of the gown and I could see her erect nipples up against the silk material.

She looked up and down my body. I have to admit to having a good physique and mum appeared impressed with what she saw.

“I always thought I had a handsome, sexy son,” she said, “and now I know that I have. You are so good looking and you certainly appeared to please Aunty Susan, with what I could hear,” she continued. Looking straight at me in the eye, she then asked, “Did you enjoy coming in my panties?” Before I could answer she continued, “I know you’ve been wanking into my panties for a while now. I leave them out for you to find you know. Then I go back and see if they have your sperm on them.” 

She explained that my dad had first alerted her to this practice, explaining that all boys did it and that she got excited by it. She even told me that sometimes she would leave her panties for me to find after she had been fucked by dad, just after her pussy had been filled with his cum, which had then started to leak into them. She wanted me to smell that on the material as well.

She then explained that by fucking Aunty Sue I had now caused a real problem between her and her sister.

It turns out that ever since they were at university together, they would hunt for men in pairs and would always share a cock.

“If Susan found herself a cock, she shared it with me. If I found a cock, I shared it with her,” Mum went on, “we’ve both had the exactly the same cocks inside us. No exception. Now do you see my problem?”

She admitted that she shares my dad with Aunty Sue. Equally, Aunty Sue shared her ex-husband with mum and the four of them would fuck and suck in front of each other most weekends. When I was younger this wasn’t a problem, as I would be asleep, but as I got older mum and dad would encourage me to go and stop over at a friend's house on a Saturday night.

The only rule they had was that the men weren’t allowed to come inside the other woman’s pussy and this was why mum and Aunty Sue grew to enjoy anal sex so much.

“So what am I to do with you?” asked mum. “Susan’s enjoyed your cock, your dad’s away and my pussy is soaking wet after listening to you and Susan fuck and suck all evening.”

With this, she allowed her silk gown to come undone and fall off her shoulders. Her breasts were just like Aunty Sue’s for obvious reasons and she looked so attractive. She sat down beside me and looked me straight in the eye as she reached down and started to stroke my cock over my boxers. At the same time she positioned her breasts in front of my mouth and I instinctively started to suck them.

She gave out a slight moan as I started to suck and squeeze her nipples as her hand continued to stroke my cock.

“Oh, Richard, that is so good and your cock is so big,” whispered mum, “please pull my pants to one side and stroke my pussy.”

As mum continued to stroke my cock, I had one nipple in my mouth and one nipple between my thumb and finger gently rubbing as my other hand stroked her pussy through her panties. I pulled her panties to one side and I felt how warm and soaking wet her pussy was.

My fingers found their way up my mum’s pussy and I started to finger fuck her as I continued playing with her breasts, at the same time she was wanking my cock which she had now released from my boxers.

“No coming up me,” mum said as she stood up, removed her panties and then positioned herself above the tip of my cock. "You do know, that if your cock goes inside me, that we will have crossed a point that we can never undo? Is this what you want," she added.

I raised my hips so that my cock started to enter mum's pussy, letting her know that I wanted to fuck her as much as she wanted to fuck me.

Slowly at first she helped me get my cock right inside her and she then started to ride my cock before leaning forward, offering me her breasts again to suck on.

“Oh God, your cock is so good, so big and it fills my pussy,” cried mum.

“Mum, your pussy is so wet but tight at the same time.” I replied.

“Call me ‘mummy’,” she commanded, “call me ‘mummy’ as you fuck me. Call me ‘mummy’ as you give me your lovely thick cock.”

“Oh mummy, I love you,” I found myself saying.

Our fucking got more frantic as mum kept on with the high tempo rhythm and I kept on sucking her breasts as I fucked her.

“Mummy, I need to come,” I shouted, “I need to empty my balls in you.”

“Not in my pussy,” replied mum as she climbed off and then got on all fours. “Fuck my arse; fuck my arse like you fucked your Aunty Sue’s.”

I positioned my cock in front of mum’s brown hole and pushed. It went straight in and I began to fuck her arse.

“Talk to me, Richard,” she yelled, “talk to mummy as you fuck me. Talk to me like I heard you talking to Aunty Susan.”

“Oh, mummy, I’m fucking your little shit-hole. Your dirty, tight little shit-hole and I’m going to fill it with my spunk. Is that what you want, Mummy?” I shouted.

Mum was stroking her clit and had put two fingers in her pussy and was stroking my cock with them as I fucked her arse and then I started to come.

“Mummy, I’m coming. I’m coming in your arse, Mummy,” I yelled. 

Just then mum’s body started to shake as her own orgasm came over her and the reaction this caused by making her tight little hole go rigid just took me right over the edge and I emptied all of my spunk into her brown hole.

We were both exhausted by the sex we had just had and fell asleep in each other’s arms.

I woke up next morning and mum was downstairs cooking breakfast.

“You’ll need a good breakfast to rebuild your energy and stamina,” mum said to me as I walked into the kitchen. “Your Aunty Susan is coming round in an hour.”