I had to go away for a few days because of work; it's not unusual for me, so Pat was used to it. Before, she would spend time with girlfriends, but last time I was away, she was mostly with Dave, the guy I was sharing her with. This time, though, Pat asked if he could stay with her until I came back. At first, I was reluctant to say yes but caved into her request after some sucking up from her.

On this trip, I would be working in a town close to where Sam lives. Sam is Pat's older sister, not by much, but you would never guess because they look so much alike. Sam has shorter hair, but the same slim figure as Pat and maybe slightly larger breasts.

The idea was I would meet Pat at Sam's on the way back. Sam lost her husband about a year ago and is just beginning to regain her life and bring some normality back into it. I've always liked Sam and her sense of humour. One time while I was following her up a flight of stairs, she stopped and asked me if she had remembered to put on her underwear. I had taken a look, but she had remembered and when I told her she had she apologised. That became a standard joke from then on.

When it was time to leave Pat came out, we kissed, and I gave her breast a squeeze.

"Thanks for letting Dave stay," Pat said.

"I'm still not sure it's a good idea."

"I know, but I'll give you something special, anything you want later," she said.

We kissed again, and I left.

Work went well, and after a couple of long days and a few hours, I finished everything I had to do. I rang Pat and asked what the plans will be now seeing I have finished earlier than expected.

"Give me a short time, and I'll ring Sam," she said.

Not long after, Pat rang me back and said I should go to Sam's as planned, but it was too late for her to leave now, and she would catch the bus and meet Sam and me the next day. I arrived mid-afternoon at Sam's not knowing if she would be home, but I was pleased when she came running out to meet me. I got out of the car, and she gave me a hug and a kiss.

"Great to see you I've been looking forward to this all morning," Sam said, "Get your things and come inside."

I followed Sam into the house eyeing her cute little arse and well-shaped legs.

"You're looking good, Sam," I commented.

Once inside Sam said, "I know what you were referring to, you naughty boy. Now put your bags in your room I'll get a glass of wine."

When I had finished, I went into the living room, Sam was sitting on the settee by the coffee table with two glasses on it. She got up and met me halfway, and to my surprise, she put her arms around my neck and gave me a long kiss on the lips.

"Sit down and tell me how my lucky sister is getting on."

"You talk to her more than I do, you should be letting me know how she is," I said.

"That's true, do you want me to tell you how she is?"

This piece of banter told to me Sam's head was in the right place.

We talked for some time, Sam tried to convince me things are going well, but she admits it’s still particularly hard at night when she is alone in bed.

"Get yourself a young man," I said.

Sam was just about to take a sip of wine when I said that and it caused her to spill a little on her dress.

"Fuck," she said, "That's going to stain. Here, unzip me."

She turned her back to me, and I unzipped her dress. She quickly wriggled out of it and went into the kitchen. When I got there she was putting vinegar on the stain and then put sea salt on.

"There I'll wash that later and it should be alright."

Sam turned and caught me looking at her half naked body; causing her to look down at herself.

"Oh, I never thought, I just wanted to clean my dress."

I stood there looking at her in just her bra and panties, the tops of her areola showing. We stood motionless for a short time and then Sam put one arm across her chest and with the other she unhooked her bra. Slowly, her arm fell, revealing her mature, well-formed mounds, large pink areolas and erect nipples. Her arm dropped to her side, and the bra fell to the floor.

I held my hand out, and Sam took a step forward and took hold of it.

She pulled me closer and put my hand on her breast.  Half-heartedly, I tried to pull away.

"No, don't," she said "I want you to touch me, I need some intimacy in my life. I've never stopped wanting sex, but it always seemed too soon, just not the right time.

"But there's Pat, and you're my sister in law."

"If you can look me in the eyes and tell me you've never fantasised about fucking me the same as I have you, then I'll get dressed and say no more," Sam said.

"You know I've always wanted to get you naked, but... "

"No buts," Sam said, "Now's your chance."

I put my arms around her and gave her a kiss, she opened her mouth and let my tongue in. Sam wrapped her arms around me, and the kissing became urgent and passionate.

Sam started to pull on my shirt and at the same time, I began unfastening my jeans. As I stood in just my underwear, we resumed kissing again, and I could feel the softness of her breasts and the points of her nipples on my chest making me more aroused.

"I can feel you're hard. Take me to bed," she said.

She took my hand, and we strode quickly to the bedroom.

Once there she got onto the bed and laid on her back, I stood at the foot of the bed and removed my boxers. I was naked in front of Sam, my cock hard and erect. A flush of embarrassment came over me but left quickly when Sam smiled at me. I leant forward and took hold of Sam's ankles and pulled her towards me until her bottom was on the edge of the bed.

"Forget any foreplay; I just want your cock inside me," she said with some impatience in her voice.

I reached out and took hold of her panties, and Sam lifted her bottom off the bed to make it easier for me to remove them. I couldn’t believe it, Sam was stark naked before me, her magnificent breasts slightly sagging to the side. As I scanned down her body, I saw a mound of black hair that reminded me of Pat.

I looked back at Sam's face, she smiled and mouthed, "Fuck me."

I put my hands underneath her hips and lifted them off the bed. Sam reached behind herself and got a pillow and placed it underneath her arse. I put my hands at the top of her thighs and touching her lightly, slid them down her legs. I took hold of her ankles and lifted them, and at the same time spreading them wide.

"Please, I'm ready to cum. Shove your dick into me, I can't wait."

I looked down and saw her inner lips protruding and the entrance to her vagina beginning to open.

I moved my hips forward, and that's where I put the tip of my cock. Another slight movement and the head of my prick disappeared into Sam. Slowly I went further inside her until she had the full length of my shaft in her hairy pussy.

I pulled back until I was nearly out of her and held myself there for a couple of seconds and then thrust my hips forward sinking my prick into her as deep as I could. I started to fuck Sam slowly and quickly, sometimes when I was fully inside I would push again trying to get deeper.

Now, as I withdrew, my cock was glistening with her juices. Sam was moaning while biting her lip and had a firm hold of the bed sheets with both hands.

"I'm going to cum again; I can't last any longer," she said.

I took my penis out and saw liquid begin to run out of her, and she shouted an extended, "fuuuuck!"

Once her orgasm had subsided, I put my cock back at the entrance to her vagina and pushed myself deep into Sam not stopping until my groin hit her pussy.

"Fuck, yes!" Sam said loudly, "Do it like that, my cunt needs a good fucking. Fuck it, Gary."

She started to make soft moans that quickly got louder and then asked me to go even faster and harder.

I couldn't last any longer I was ready to cum myself, but just before doing so, she said: "My god, I'm cumming again. Give me one more push."

Before she had finished, I had started to shoot my load, but I did try to go deeper. I don't think it mattered; her orgasm was strong and made her physically shake.

Sam lay there for some time, and when she opened her eyes, she looked at me and smiled. I was exhausted, drained of energy and sperm, so I got onto the bed and lay by her side. I held one of her breasts and gave her a deep kiss.

"Let me clean you," Sam said.

She moved down my body and took my penis into her mouth and skillfully sucked and licked me clean.

Sam laid back by my side smiled and said, "I think that got rid of all my sexual tension. Next time, will you make love to me?"

That night we went out and had a very nice meal, and when we returned we did just that. Not just fucking but slow passionate lovemaking until the early hours of the morning.