My wife Jane and I were just getting used to the idea of not having kids around anymore, now that our youngest daughter had finally reached university age. It now meant that all our weekends were free and we could finally go visit family and friends at weekends without having to worry about what disasters might ensue while we were away! It also meant we could tag a few days' holidays onto the weekend and go a little further afield.

So, here we were, finally paying a visit to Jane’s sister Rachael over in Norfolk, who we hadn’t seen for at least two years! She had moved out that way to lead a simpler, less expensive lifestyle, given that she had no hubby or kids so didn’t need the big house she previously owned. Instead, she had given up her job and moved to a two-bed static home at a fraction of the cost and had been living there happily ever since.

We had kept in touch via phone and skype of course, but it was great to be able to meet in person once again and enjoy a few drinks and each other’s company. And boy could Jane and Rachael drink! I thought I was good until I met those two!  On our first night, while I downed about six bottles of beer, they managed to get through two bottles of wine each, before Jane finally passed out and had to be put to bed.

We carried her between us, then Rachael took great delight watching me try to undress Jane! She refused to help, saying ‘undressing a lady is husband’s duty’, then creased up with laughter when I managed to rip Jane’s tights whilst struggling to pull them down over her thighs. She also insisted that I remove Jane’s panties and bra, saying they would be very uncomfortable in bed.

I’ve got to say that at this point there were no erotic thoughts going through my head, but to Rachael, it must have looked like a scene from a soft porn wrestling match as me and the unconscious naked Jane writhed on the bed! Nonetheless, it was an amusing end to the night, and with a few blushes I finally got Jane comfy and me and Rachael said our goodbyes.

I sat there on the en-suite toilet chuckling to myself over what had just happened. Rachael was still a good sport and we would laugh even more about it tomorrow when we got to tell Jane! My head was also beginning to spin a little as those beers finally took their toll, so I thought I would just sit there a little while longer until I regained my balance.

It was at that moment I caught notice of a faint light shining through the air vent high up on the wall behind me. I could see it through the sink mirror directly opposite and there seemed to be some kind of shadow across it. As I said, my head was more than a little fuzzy, so I didn't think anything more about it. I just finished my ‘drunken sit-down wee’, undressed, then staggered off to join Jane for a spot of late-night ‘spooning’.

I was awoken the next morning by Rachael with a steaming cup of tea. I wasn't sure how long she had been standing there, but my modesty was protected by the duvet, so my chance of being ‘caught naked’ by a secret voyeur had been missed. Maybe I could engineer some ‘accidental exposure’ tomorrow if tea in bed was going to be a daily routine?

I snapped out of my little fantasy to hear Rachael shushing me and saying that we ought to let Jane ‘sleep it off’ for an hour or two, but I should get up soon and shower so that I could help her prepare breakfast. I was told that I could lie in for five minutes while she had her shower as the water flow wasn’t too good if both showers ran at the same time. So I drank my tea and then tidied up Jane’s clothes. I stuck the ‘holy’ tights in the bin and gathered everything else up ready to go in the bathroom washing hamper.

As usual, I couldn't resist a quick sniff of Jane’s panties from the night before. She has the most delightful scent that makes me go wild, causing me to wonder whether Rachael might have a similar scent. I would make it my mission to hunt down a pair of her panties over the weekend and find out. 

Just at that moment, there was a knock on the door. It was Rachael letting me know it was now ok to shower. Thank god she didn’t just come in like she had earlier with the tea. How embarrassing would that have been had I been caught with my dick in my hand and Jane’s panties up to my nose?

I quickly suppressed my ever-increasing erotic thoughts and headed into the bathroom. I dropped the clothes in the hamper and admired my semi-erect dick in the bathroom mirror. I had a decent body and was proud of the way my manhood looked on this fine Saturday morning. Maybe it would have been exciting for both of us if Rachael had entered instead of knocking after all! 

But all that tea and last night's beer couldn’t wait any longer. A quick turn and lift of the seat and I let the floodgates open. It was the most enormous morning piss and extremely satisfying. Rachael probably thought I'd already started my shower with the sound of all that running water! I stood there for a while enjoying that ‘post-piss’ contented feeling, then turned and sat down for my 'other' morning constitution!

As per the night before, I found myself looking at the ventilation grill through the mirror. Where did it lead, and why was the shadow now on the left? I was sure it was further to the right last night, but I guess shadows move depending upon the time of day. But when it then moved again in front of my own eyes, I realised that it was actually someone on the other side!

My brain went into overdrive as I tried to think through the layout of Rachael’s house. There was a corridor between our two rooms, but that came to a dead-end roughly in line with where our en-suite bathroom started. Of course, Rachael's en-suite must back onto ours, giving her the perfect vantage point for standing on her toilet and peering in at me through the grill. This presented her with a glorious view of every angle thanks to that well-positioned mirror.

I instinctively placed my hand over my dick and quickly averted my gaze. Did she know I had seen her watching? Should I shout out and let her know the game was up? Or was the game just about to start? In a split second, I knew which way this was going to go. My heart was racing and my dick was stirring. I was going to take my hand away and play this one out. That fantasy about Rachael catching sight of me naked was actually happening without any ‘engineering’ required from me!

I couldn't believe my luck. Here I was, with the perfect exhibitionist opportunity and I was going to milk it (literally!) for all I could get. But I had to play it cool, beginning by removing my hand after pretending I had merely been scratching that morning itch from my balls. I placed both hands on my knees and with legs akimbo, proceeded to finish ‘dropping the kids off at the pool’.

This was a very personal exposure indeed, not something I ever expected to share with anyone, but it felt completely liberating knowing that Rachael had a birds-eye-view of everything. I paused briefly, then proceeded to wipe, lifting one cheek in the process, giving Rachael an even greater view of between my legs and underneath. I have to admit that I wiped for longer than necessary, just taking in the moment and enjoying the sensation of being watched.

Then I casually stood up, yawning and stretching a little, giving my semi-dick and balls another slight scratch in front of the mirror. Should I sniff? It's what everyone does in private and would make it even more convincing that I thought I was alone. So I inhaled that sweaty, musky smell from my fingers, gave a contented smile into the mirror, then turned to flush.

This was an opportunity to show off my tight muscular butt to Rachael. I was proud of my gluteus maximus and was sure that Rachael had admired it through my jeans last night as we ‘wrestled’ on the bed. She would have also seen it when I pissed. It was so exciting to know that everything I had done, and was about to do, was being scrutinised by my sis-in-law in vivid detail.

So I took my time while bent over the toilet, wiping off fictitious splashes around the seat. Would she be able to see my balls peeking out from under my slightly parted butt cheeks? Would she get a glimpse of my puckered anus from that angle? It was a lovely thought, but I couldn’t hold the position for long without looking suspicious, so I turned and faced the sink to wash my hands.

I then did all the normal stuff - shave, clean my teeth, ‘check out my muscles’. I even gave my pubic hair a little trim with the nail scissors, just so that I could stand in front of that mirror for as long as possible, knowing that Racheal was watching intently from just a few feet away. The thought of her eyes on my dick had brought me fully erect, so I turned to the left, and then to the right, appearing to admire myself whilst actually presenting Rachael with a view she could only have dreamed of.

But I didn't touch it. I felt that I might give the game away if I were to now start wanking in front of the mirror. I had to do this the natural way and luckily the shower was next to the toilet, with a full plain glass door. This meant that it too was within full view of the mirror and I did wonder whether this was all by luck or had Rachael kitted those bathrooms out with this moment in mind?

I was so turned on at this point, I even ‘threw caution to the wind’ and grabbed Jane’s musky panties for a deep inhale. It was such a turn-on to let Rachael into my secret fetish, and I hoped it might encourage her to absentmindedly leave her own underwear for me to find later that weekend. Worth a try eh?

I dropped them back into the hamper and entered the shower. There was a powerful extractor fan directly above, so Rachael's perfect view was not obscured by steam settling on the shower door. Another well-thought-through feature from Rachael!

I let the water run over my head and down my body. Again, taking great delight in the fact that Rachael could see everything but didn’t know I knew. This knowledge gave me infinite power to do whatever I pleased with absolutely no redress from my sister-in-law. It was my private time that she was invading so I could just let myself go with complete abandon.

I turned off the water and reached for the shower gel and whilst facing the door, I squeezed it so that it landed in thick globs on my engorged cock. My lathering was to start at my dick and finish at my dick. I began to rub the gel all over my cock and balls, down my legs, up my body and arms, then down my back and onto my butt. I turned to present its soapy curves to Rachael and began to massage my rounded cheeks, sliding my hand up and down the inside of my crack. I reached in from the front and bought one hand under my balls and up to my anus. That felt good as I massaged it from both above and below.

My cock was fully bursting now, and very close, so I positioned myself sideways, ready for my ‘watcher’s’ optimal line of sight. I couldn’t quite believe it, but my wife’s sister was about to see me cum, with the full silhouetted shape of my body presented side on to her so that she could enjoy seeing my hand slide from the bottom to the top of my cock and back again. Every stroke, every inch.

The feeling was exquisite as I began to pump it back and forth. The view must have been spectacular, but the orgasm I soon reached was even better, as load after load spurted out and drenched the side wall of the shower. I knew that Rachael would see it slowly slide down the tiles and drip to the floor. She would see my body quiver with excitement. That hot flush spread across my face and chest. That weak-kneed ‘stagger’ followed such lustful outpourings.

I had just put on the full wank show for Rachael's personal attention and absolutely nailed it. As I stepped from the shower I could see she was still watching. I had never felt so contented. That warm ‘after-sex’ glow spread through my whole body as I towelled myself dry, raising one foot at a time up on the toilet, directly in front of the mirror of course. I took care to wipe off the last few oozings of sperm from my dick and continued until everywhere was completely dry, finishing off with deodorant and a splash of aftershave, before returning to our room to dress. 

A few minutes later, I got the call, ‘How long are you going to be in there?’ to which I replied, ‘Just coming,’ as I took one last peek at the air vent to confirm that the shadow had now gone. There was no one else home other than the still-sleeping Jane. Her sister Rachael was indeed a practising voyeur. She had enjoyed me enjoying myself, and I loved it.

We were now going to chat and laugh together as if nothing at all had happened between us, whilst we would both be getting moist down below as we reflected on our own ‘secret’ perspective of our intimate encounter.

I opened the door and greeted Rachael with a peck on the cheek.

'What’s for breakfast, gorgeous?' I asked.

‘Some nice juicy sausage’, she replied…