Please read chapters one, two and three before proceeding.
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Over the next couple of days mum made more of those suggestive comments, about how I was growing up and that I was becoming a man. More noticeably though was my awareness of Gail's persona, she appeared to be a lot more liberal around mum and I, both in her dress and manner than when with the other girls, I guess that all three of us had an agenda and all very similar.
One day when Gail was out I decided to have a snoop around here room, I don't know why I hadn't done it before. To my surprise I found some very sexy underwear, considering she was only 18, she had excellent taste and it was hard at first to imagine that under her trendy street clothes she wore sexy demure underwear. At the side of her bed was a book which looked like any other romantic novel but was entitled "The Forbidden Fruit". It intrigued me as the blurred image on the front was of two naked women. I flicked through the pages and read parts of what turned out to be a hot story about two women from different cultures, two women who found a fondness for each other that turned to friendship then desire and passion.
Well this was great, it cemented the suspicion that Gail might reciprocate mum should she make any advances towards her and also explained why she was more grown up and feminine than her elder sisters. It also explained too the noticeable lack of male pictures in her room.
The next thing I did was a bold step for me; one night when the house was quiet I entered Gail's room knowing that she was reading alone on her bed. I was dressed only in T-shirt and jockey shorts and asked if she would rub my shoulders for me as they ached real bad. She too was very casually dressed and had bare legs and light blue panties under her T-shirt. I managed to catch a glimpse, as she sat up, of what appeared to be her dark haired pussy, tightly covered by the thin blue material of her panties, this obviously caused my dick to stir. Gently she applied some oil and massaged my shoulders and back with such a calming and soothing effect it felt almost sexual, we talked about this and that until I mentioned her book
"What you reading?"
"Oh it's just a romance type thing, nothing too special" she replied
Not wanting to miss the opportunity I continued probing, "It looks rather raunchy to me, mind if I take a look?" Without giving her the chance to stop me I collected it from the floor and opened it, Gail made vain protests but I read out a few lines. It was describing the feeling from one of the characters to another in a strong sexual manner.
"This is great" I said "That's my type of story, two girls getting it on is wonderful!"
Gail returned to my shoulders and said in a casual tone, "me too"
My dick sprang to attention like a soldier on parade, I guessed that Gail couldn't see my condition from where she was but it would have been obvious should somebody walk in. I sat there half naked with a raging hard on as my sister, who was also half naked, rubbed oil on to my back. She seemed to enjoy taking care of me but didn't seem to show signs of wanting to take it any further. I needed to get mum in the conversation and racked my brains for something to say, it was a little loose but I thought what the hell.
"You know Gail, if mum walked in now she'd think something funny was going on"
"Oh I don't know," she said calmly, "I think mum quite likes the idea of us being more open with each other."
"Open, in what way?"
"Well, we're all grown up and I guess there's no need to behave like teenagers now." She spoke with a sense of nervousness but continued, "None of us are shy and it's so noticeable how you walk around half naked pointing that thing at us."
As she spoke she prodded me in the back and pushed a little harder against my shoulders, "Did you think we hadn't noticed it?"
There was only one thing to say. "Notice what?" sounding surprised.
"Stuart, you've been getting mum all hot and bothered now for 6 months and it's a good job the others haven't noticed, but I have."
I was flabbergasted "So what has mum said to make you think that?"
"Nothing, but it's obvious dummy, you can tell by the way she's acting, she's like a woman possessed around you. It's obvious to me how she flaunts herself and gets your attention, she even asked me things about you last week."
"Asked you, asked you what?"
"She asked if I had noticed how grown up you were now, and how you seem more confident with yourself, she jokingly mentioned she'd seen your dick and how big it looks."
Just then, and out of the blue, Gail stopped massaging me and slapped my back, "Stuart, it's me you're talking to, you can stop this bullshitting and stand up."
She pushed me away off the bed so I had to stand.
"Turn around." By the tone of her voice it was an order not a request and one I complied with.
My dick was firm and bulging my pants, like the proverbial tent pole. "See what I mean, you walk around with that thing on show and expect us not to notice."
Without any warning she hooked the finger of one hand into my waistband and pulled, exposing my hard-on. She wrapped her other, oil coated, hand around my shaft. The feeling was surreal, my own sister, only 18 months younger than I was, was about to wank me off and mum was still downstairs in the lounge.
I wanted to touch Gail but she stopped me, I wanted her T-shirt off and desperately wanted to see her sweet young pussy, but saying that, what I was more desperate for was to shoot my load. Gail's strokes were slow and firm, she held me at the base and pulled on my foreskin, she made no attempted to get closer or kiss but just gently stroked my old man as she looked into my eyes, I was at her mercy and she knew it.
I made another attempt to touch her but again access was refused. "No, not now," she whispered and gave me the sort of smile that meant 'No, not now, but maybe some other time.' She knew I was getting close to the inevitable and began to pump me harder and faster, her attention was solely in making me come. Her free hand gently squeezed my balls as I rocked my hips in time to her strokes, she knew exactly what was coming her way.
"Oh God Gail, I'm gonna cum." She didn't look up or even acknowledge my statement but continued to watch her own hand pumping away at my old man. Her eyes were fixed and her smile was knowingly rude, I bucked a couple of times and as my pending orgasm approached it became obvious that she was intent on making me cum quickly. I couldn't hold on any longer and with a deep throaty grunt I let loose a full heavy load of spunk. It left my dick like a bullet from a gun, hitting Gail on her chest and covering the back of her hand, I just couldn't believe it! My sister had just pulled my dick from my pants and wanked me off good and proper!!
Well you can imagine how that left me feeling, standing half naked in my sisters room and looking at the dirty grin on her face and my jiss all over her T-shirt and hand! Gail told me to go clean up and if I was lucky she'd suck it next time, but only if I agreed to do something for her.
"So what is it you want?" I asked
"I want to watch you seduce mum!" The look on her face was so devilish I knew she meant it, "I know she'd let you, trust me."
"So let me get this right, you're telling me if I get it on with mum you'll suck me off?"
"Right!"
I was dumbfounded, Gail wants to watch as I satisfy my greatest sexual fantasy, this was a bargain from my point of view. As I said before this was surreal, I'd previously not given my sister a second thought as I was so obsessed with mum, but now, she was the catalyst and incentive for me to finally nail mum.
The atmosphere the following night was so sexually charged I had a raging hard on all evening. Gail was again dressed in just T-shirt and panties and was doing her best to keep me desires at fever pitch. She knowingly flashed her open thighs to me on more than one occasion and made the most of showing me how hard her nipples were by pulling her T-shirt tight against her chest. I guess mum was aware that something was happening because her state of arousal was clearly obvious the minute she removed the jacket of her business suit. Her blouse was thin and her bra failed to hide her erect nipples and I think she knew it. She must have known because I caught her looking down at them on a couple of occasions and she did nothing what so ever to disguise them.
It was quite late before the others went out leaving the three of us home alone, I sat opposite Gail who was on one of the sofa's, mum was in the kitchen fetching us all a glass of wine and Gail reminded me of her promise.
"Tonight's the night big boy," she smiled, "Mum is hotter than I've ever seen her before, and don't forget, if I can watch you can have me too!"
Well that was a "no brainer!" How I was going to achieve it I didn't know but Gail was right, tonight was by far the most aroused I'd seen mum (and Gail for that matter) and if it didn't happen tonight it never would. Gail told me she would go out for the evening, but I was to leave the patio door curtains slightly open which would allow her to see everything should I manage to get mum into the other sitting room. Before mum could return with the wine Gail leant over, squeezed my dick and licked my face, "remember, do mum and you can do me!"
Mum appeared from the kitchen still dressed in her work clothes, black skirt, stockings, heels and cream blouse which did little to hide her bra and the shape of her breasts. Her nipples were still clearly visible (and erect) and again she appeared to be unconcerned about it showing. We all sat down and looked at one another, for a brief second there seemed an uncomfortable silence but Gail soon changed that, "Cheers all, here's to us and our future happiness."
"Cheers", we touched glasses and each took a drink, before I could put my glass down Gail's mobile went off and she read the text message she had received, apparently her friend wanted her to go round for a couple of hours and it was imperative she went now!
