Many of us throughout our lives have found ourselves having an attraction to our wives sister or husbands brother. And I guess I am no different. We know it is taboo, and we know it's wrong. But sometimes we just can't help ourselves. A gentle brush of the hand making contact with one another, those stolen glances at each other from time to time, those moments holding each other dancing and hoping it will never end.....We either have done it, or want to do it.

My wife and I had put off re-decorating the bathroom and decided that it had to be done. We went through our budget and decided that our best course of action was to use paper on the walls. Now I would tackle any DIY job around the house but papering was never my forte. My wife's sister however was handy with papering so I decided to ask her if she would be willing to help. In exchange I would give her a full body massage in exchange whenever she decided to take me up on the offer. A deal was secured and everybody was happy.

My sister-in-law Brenda and I had known each other for about 12 years and have on more than one occasion had a quick grope and a kiss. There has always been an electric atmosphere when we were together and I guess we just can't help ourselves. I have always been attracted to the older mature woman, her being 14 years older than me. Me being 35 and she 49. To describe her, she has an amazing body for a woman of her age. Short brunette hair, brown eyes, full juicy lips, a size eight waist, with a 30B cup size and standing about 5'6"s tall.

I got up that morning and set about getting ready for the day ahead, making sure everything was in order for when Brenda arrived. My wife had gone to work, so we could get on the job and get it all finished in one day.

Brenda arrived around 9.30am, and taking charge of the task set up up everything we needed, over a cup of coffee and a cigarette Brenda told me what I had to do to help her out. She would paste and hang the paper, while I would paint anything that was to be painted. All was agreed and we set about our work.

We walked upstairs and as I was behind Brenda, I couldn't help but notice her beautiful ass in tight jeans swaying in front of me. "Fuck me!", I thought to myself, "I'd love a piece of that ass!"

The bathroom is not overly big, and as we set about our work we had to watch where we were moving so as not to get in each others way. But on more than one occasion we couldn't help but rub against each other. This was not helping the fact that I already had a semi erection growing in my loose running pants. I was struggling to conceal it. An eight inch erection is not exactly inconspicuous.

"Philip?, can you go out and grab the brush for me?"

"No problem Brenda", and out I went to fetch it.

As I walked back into the bathroom Brenda was on her knees and sitting back on her heels leaning forward working by the radiator. I stopped frozen in my tracks. The waist of her jeans was sticking out at the back, and had slightly dropped down, revealing the smallest red thong I have ever seen. That opened the flood gates and sent a rush of blood straight to my cock, filling every capillary available. "How the fuck am I going to hide this?", I thought to myself. She would turn around to take the brush from me and all she would see was by raging erection right at eye level.

"Uh, here you go Brenda, I just have to get something", I stammered, "I'll be back to you in a few minutes".

"No problem hun"

I rushed out of the bathroom as fast as possible without trying to make and issue out of it, and went into my bedroom.

I had to release the pressure, and dropping my pants and underwear released my throbbing, hard, eight inches of meat and started pumping it. My balls were at bursting point and I was in the full throws of my expedition, when all of a sudden I hear the bedroom door open and Brenda calling, "Philip?". "Fuck, fuck, I'm busted now!", was all I could think of. Brenda walked in and caught me in full flow, cock in hand and pants around my ankles.

I stopped and with my hand still holding my hard cock, I stared at her and my jaw dropped. I was speechless.

"Well, well, well, what have we here?!", exclaimed Brenda.

"I umm, I umm, eh, umm, I couldn't help it", was all that I could manage.

"Well don't let me stop you", she said, "You might as well finish what you started".

I looked her straight in the eye and started pumping my cock again. She bit her bottom lip as she watched me. She was enjoying this, and I was building up to the point of no return. She open her waist button, and slipped her jeans halfway down her thighs, revealing that sexy hot thong. Gently teasing her crotch, and rubbing her fingers over her beautiful love mound.

"Come on baby, come for me", she purred, as she lay down on the bed in front of me.

"I can't hold back anymore", I panted.

"Shoot your load all over Brenda, baby"

With that I jerked, and my hot stream of cum ejected from my cock and landed on her crotch, followed by two more squirts.

I stood there and took in the situation. I was naked from the waist down, with my cock in my hand and I was after shooting my cum all over my wife's sister.

"Do you think you are finished?" demanded Brenda, "Your going to help me out now"

Silently, I did what I was told. I was in no position to complain.

Brenda reached up to me and pulled me down onto her. "You're going to clean my thong, and eat my pussy"

She shoved my face down onto her crotch, giving me a taste of my own cum. "Lick it clean, I don't want a mess", she ordered.

I lapped up all my cum, sucking it off her thong, and licked all the residue from her groin. I could smell her arousal instantly. Her pussy was soaking wet.

"Now you horny little bastard, you're going to eat my pussy, and that will be the end of it", and she pulled her tiny thong to one side.

I reached up, spread her pussy lips with both hands, and ran my tongue up and down her crevice as she moaned in ecstasy. My tongue alternated between tongue fucking her drenched, swollen pussy and flicking her clitoris. She reached down and pushed my head into her love box and started bucking her hips.

"YYYYYYYYYYESSSSSSS", she cried as an orgasm rippled through her entire body, her body shaking and shuddering as she whimpered.

"Oh fuck, I needed that", said Brenda. "Don't worry. This will be our little secret".

I was relieved, and managed to agree with her.

"Ok", I said, " Lets get on with the work before the day is finished".

We got the job finished that day and no more was said about our moment of fun.