Her sister

I followed my wife to the en-suite, watching her as she turned the shower on and then went to the toilet and sat down. I'd never watched anyone pee before, and while it was a little disturbing, I found it fascinating. She spread her lips apart with two fingers of her left hand, then leaned forward and waited until she started. At first just a trickle of pee came from her, but it quickly increased to a strong flow before easing back and stopping with a few drips. I got the biggest surprise of my life when my wife wiped the drips off her pussy with her hand, then proceeded to lick her fingers clean, appearing to enjoy the taste.

She stood and walked toward the shower, as I still stared, dumbstruck, at her and almost walked right into me before I hastily moved out of the way. She stepped into the shower, shutting the glass door behind her, and quickly soaped herself up with the body wash and whatever those funny puffy things women seem to love are. I was glad I'd had the glass treated when we had our windows done so it didn't fog up and I was able to clearly watch her. Even though she was my wife and I'd seen her nude more times than I could count, the fact I was watching her surreptitiously aroused me greatly. Clearly I was going to have to try watching other women showering too.

My wife was just finishing drying herself when the doorbell rang. She threw on her dressing gown, and I followed her downstairs. My wife opened the door and standing there was her sister. Even dressed lazily as she was in sweats I thought she was stunning. Her breasts weren't as large as my wife's, but she tended to show them off to better effect, and even today they were on display.

"Hi Claire" my wife greeted her, "come on in".
"Thanks sis", Claire replied, "so we've got a few hours huh?"
"Yea, AJ will be away for at least a few hours, probably the whole day. He always takes forever when he goes to the hardware store. Who knows what he looks at in there".

I lost track of the conversation as I admired Claire's form, and they chatted rapidly like two little chipmunks about random girl crap. I followed them into the lounge and stood in front of Claire stroking my rod in front of her. I was imagining sliding my dick between those perky breasts of hers and almost blew my cover, when I almost blew my load right on to her. I managed to back it off and went into the kitchen where I could jack off safely while still admiring her.

My attention was however back on the girls when Claire grabbed her bag and pulled out a pair of lacy black panties and bra.

"Do you think he'll like these?" Claire asked my wife, "I bought them yesterday".

I wondered who she was referring to; Claire didn't have a husband, and wasn't even dating anyone that I knew of. She'd mentioned casually to us she was 'frustrated' at her lack of intimacy, so perhaps she was just going to try to seduce someone at her office or something.

"I'm sure he will", my wife replied, "black's his favourite colour".
"Yea, I remember you'd said that", Claire said while reaching into her bag again, "I bought a second matching set for you too!"

This was getting bad, now my wife was going to join her sister seducing some stranger?

"Cool", my wife responded, taking the proffered lingerie from her sisters grasp.
"Let's try them on right now! I bet we'll look so hot together."

"Ha, Okay", Claire replied, placing her set down and standing up.

I swear my mouth must have dropped open as she lifted her top and sports bra off over her head in one swift move, exposing her delicious breasts directly to my gaze. They bounced a little as they were released from the confines of her top and I watched her hungrily. To my disappointment as my wife removed her top too, Claire turned around and faced the sofa before sliding her sweats and panties down her legs. She reached for her new black panties and bra, and without turning around, she slipped them on. Damn! I didn't get to see her pussy! If only I'd stayed beside her I could have got a good look. I just knew it'd have been beautiful, just like her breasts.

Claire finished doing up her bra, in front, then turned around. She was exquisite. Her body looked like it was sculpted. She had curves in all the right places, and none elsewhere. Her belly was trim, and she had enough muscle to give her shape, without being too masculine.

Oh, how I wanted to fuck my sister in law. She was just too damned sexy.

Claire walked over to my wife who'd just finished putting on her set of lingerie, and stood beside her. Fuck, my wife looked hot in that too. She wasn't as trim as Claire, but damn, she was fine.

"Oh, wow", Claire stated, "you're so hot, sis".
"Thanks", my wife replied, "though you should see yourself!"
"Come on", my wife continued, taking Claire by her hand, "lets stand in front the mirror together".

I followed the two beautiful creatures into the spare bedroom just across the hall and stood in front of them as they stood, arms around each others shoulders, looking through me at themselves in the mirror.

I knelt down in front of Claire and leaned forward towards her pussy, only covered by the thin lacy fabric, my mouth only millimetres away as my wife spoke. "Wow... we're super hot together. There's no way he's going to say 'no'. It's a sure thing".

"I sure hope so", Claire responded, "I want him so bad, I'm getting all hot down there just thinking about it". I almost laughed when she said that, almost certainly part of what she was feeling was my breath, warm and moist on her almost exposed pussy. Something to remember for later perhaps.

I had to pull back quickly as Claire suddenly moved her free hand from her side and began rubbing herself through the fabric. "Stop that!" my wife shouted as soon as she noticed what her sister was up to, "You'll get them dirty, and we want them nice and clean for later".

"Fine", Claire replied, but instead of stopping she simply stuck her hand inside her panties and slipped her finger inside herself.

"That's not what I meant!", my wife said, then sighing she pulled Claire's panties down, "At least take them off". Claire didn't even respond, instead just stepping out of her panties and sitting on the edge of the bed. Her hand was still busy, her palm rubbing in circles as her finger continued to thrust in and out of her slit.

I realised after a while I wasn't the only one watching intently. My wife was also staring silently at Claire's hand as she worked herself over. She seemed to be enjoying the show and quickly stepped out of her own panties. She leaned against the dresser and began quickly fingering her own pussy, reaching orgasm far faster than I'd known her to before. Claire opened her eyes as my wife moaned out, and the shock of seeing her sister cumming right in front of her effected her too as she suddenly cramped up, her own orgasm hitting hard.

They both shyly smiled at each other, before heading back out to the lounge, Clair getting dressed, and my wife putting her gown back on.

I didn't know what they were planning, but I needed to cum too so I stayed where I was and thinking of Claire, quickly came all over the dresser where my wife had just been.

Now that my head was somewhat clearer I needed to figure out more of what was going on. Was I now permanently invisible, or was this a once off temporary thing? Alternatively, was this now an ability I could learn to activate at will?

I went upstairs and grabbed some clothes before sneaking out back trying to keep my clothes low and out of sight made my way to the small woods nearby.

Sitting in a little clearing in the woods I began to concentrate on trying to become visible. Nothing. I focussed my thoughts, trying to lose all distractions. Still nothing. I kept at it, trying to remember what I'd been thinking about before going to sleep the night before, whether I'd been bitten or anything unusual had happened. Nothing.

I was about to give up after an hour when I noticed I could see a slight shadow in front of me. I lifted my hand and could just see a fuzzy indistinct blur. I was partially blocking the light, and becoming visible again. I again focussed my thoughts, finding it easier now, and watched as my arm slowly became more visible. I spent another few hours concentrating before I was able to make myself become visible, and even better, invisible again. By about 4pm, although the process was slow and taxing, I had now developed my concentration to the point where I could control the process to some degree. Starving, but somewhat more confident I dressed and went back home wondering what I was going to find.