After tea on the Friday evening Thelma stopped me as I was going into upstairs to my room. Her eyes looked wild and her breathing was heavy.
"I'm going to a party," She said in a low voice, "do you want to watch me getting undressed?"
I nodded like a puppet.
"Wait in my room...I'll be up in five minutes."
I skipped up the stairs two at a time! I nervously let myself into my sister's bedroom. I'd been in many times before – borrowing her dirty knickers and stuff to use when I played with myself, but this time was different; I'd been invited.
As good as her word Thelma arrived five minutes later.
"Take your shorts and pants off," she told me as soon as she entered the room, "I want to watch you have a wank."
I did as I was told and dropped my shorts and sat on the end of her bed with my stiff cock already in my hand.
Without ever taking her eyes off me, Thelma slowly unbuttoned her blouse revealing her new 'Cross your Heart' bra which gave her breasts a lovely shape then unzipped her mini-skirt showing the merest hint of her yellow knickers.
"Are you ready?" She panted as she slipped off the white blouse and her skirt slid down her tanned legs.
I nodded my head and began tugging at my boner.
My sister then put a hand behind her back and deftly unclipped her bra; the other held it in place at the front. I could see her breasts were heaving and her breathing was becoming forced as she eventually threw it onto the floor. My own heart was racing when I saw her dazzling tits and massive pink nipples. Thelma began rubbing her tits and teasing her erect nipples as I matched her stroke for stroke.
She was now breathing very deeply through her mouth as she pulled her knickers down. My strokes were getting faster when I spotted strands of her sticky juices sticking to the gusset as she peeled them over her arse.
After throwing them at me, Thelma nimbly lifted her left foot onto her dressing table chair exposing her delicious hairy fanny to my gaze for the second time in a week.
"Do you like my cunt, Brian?" Thelma gasped as she fumbled behind her on the dresser.
I nodded meekly and tried to slow the speed of my wank.
"Would you like to see me fuck my juicy cunt with...this?" She panted as she produced a long wooden handled hairbrush.
"Yes please." I whispered as she stroked the thick end against her gaping flaps.
"Ooohhh," she groaned as the first inch or two easily slid inside her pink slit, "ooohhh Brian that feels soooooo good."
My eyes were like saucers as my sister pushed the wide handle of the brush all of the way inside her vagina, until the bristles were touching her pubes.
I was so shocked I'd stopped playing with myself.
"Brian...Brian," she puffed, "I want to watch you wank yourself....while I fuck my ...cunt!"
My hand quickly began rubbing my aching shaft as Thelma arched her back and looked in pain as she energetically fucked her dripping hole with the hairbrush handle.
"Ohhhhh.....Uuuggghhhh," her face was contorted as she hammered the brush as deep inside her body as it would go, "this is so...fucking...good...Uuuggghhhh"
Thelma's legs were now spread as wide as humanly possible as she began rubbing a spot at the top of her gash for all that she was worth.
"Come here!" She squealed, "Spunk on me...SPUNK ON ME!"
In an instant I was standing inches away from her and shot a load of my goo onto her sweaty pubes and the back of the hand with the brush in it.
As I stepped back I became a little anxious as my sister threw her head back and began shaking all over as she gasped and groaned, "Yes, yes...YEEESSS!"
"Sis?" I asked, "Are you alright?"
With a grin the size of a bridge she nodded and reassured me that she couldn't have felt better as she smeared my spunk across her tits.
"You can go now," she nonchalantly told me as she picked up her bathrobe, "but be ready when I come home later...I've got a special treat for you!"
The rest of the night was a nightmare as I re-lived the hairbrush scenario hundreds of times in my head but racked my brain for what my 'special treat' was going to be.
I was already in bed when I heard the front door open and close. My heart was beating like a drum as I heard every single stiletto footstep creep along the landing.
Then there was silence until my bedroom door slowly eased open.
"Brian? Brian?" Thelma drunkenly whispered, "Are you awake?"
Awake! I couldn't have slept if you'd given me 100 of mum's sleeping tablets!
"Ssh...yes." I said in a low voice.
"Come to my room then."
Thankfully we lived in a large stone house and our parents slept well away from our rooms, but I knew that I had to be as quiet as possible as I tip-toed across the landing.
There was only a bedside light on when I crept into my sister's room; the shadows making everything even more sexy and mysterious.
"Take your fucking pyjamas off and stand over there." Thelma giggled drunkenly.
In front of our parents and at work Thelma was the epitome of an English Rose; but she took great delight in talking as dirty as possible to me; using fuck, cunt, piss, cock and shit like 'God Bless You'! In a Pavlovian way the effect is still with me today; I love women to talk dirty to me.
I stood naked and cold beside her bed as she seductively did a strip-tease for me until she was standing in just her black seamed stockings and suspenders.
"I want you to do something really special for me." Thelma purred as she sat on the edge of her bed with her legs wide apart as usual.
"Kneel in between my legs and kiss my cunt." She laughed to herself.
"Kiss it?" I questioned her.
"Yes... fucking kiss it ...kiss my cunt." My sister playfully growled.
"But...but you," My stiffness withered away as I continued, "but you...pee out of there!"
"Ha, ha, ha" she chuckled, "don't worry baby...it won't taste of...piss...just do it for me...please."
I bent forward, unsure what to do and gently kissed the hairy part at the side. It didn't smell half as bad as I'd expected.
"Mmmm that's nice." She lied, "now the fleshy parts...kiss my piss flaps."
I bent forward and kissed the dangling flaps of skin.
"Ooh that's good...more...more, more." She sighed as I kept planting little kisses all over her sexual folds. Thelma pulled her legs back until her knees were waving in the air which made her pussy lips peel apart.
"Lick it...lick my cunt for me." My sister pleaded.
I tentatively stuck my tongue out and lapped at the frothy liquid that was oozing out of her gaping hole.
It had an odd taste – not sweet and not sour, just odd, like nothing that I'd ever tasted before.
I quickly acquired a taste for it though!