This story takes place following the events in JIMP#6 where Bobby Priest, whilst trying to help his private detective father Jim, encountered Lady Helen Windthorpe, the Dominant Horsewoman.

Saturday had come again which meant escape from school and time to muck about with my mates. It was an unusually warm autumn’s day, probably the last before the cold bite of winter makes its presence felt. Mum had been a bit overprotective recently following my run-in with the legs and feet of Lady Helen [JIMP#6]. She made it clear that she didn’t want me straying to far from the house. Well sod that, I’m not a kid like my younger sister.

Mum and Dad had gone out shopping at Milton Keynes, mum wanting to finish off Christmas shopping before the prices got hiked up. I was told to stay in the house and look after Jackie. However I reckoned she would be alright on her own. My mates ‘Superrod’ Johnson and Chris Moye had come over to the house and we were about to go out and lark about.

“Right I’ll just tell Jackie we’re off and then we can go” I told them walking into the garden where my kid sister was practising her gymnastics. Jackie had been doing gymnastics for many years now and she was by far the best in the local team, competing in regional and national competitions.

She was about 5’1” with long golden hair currently tied back with a red ribbon into a ponytail, blue eyes, a small slender nose and a small mouth that smiled a lot. She was very pretty, even I had to admit that. Superrod said “Hang about Bobby, there’s no rush, we don’t need to go just yet”. I turned around to face him and saw he was watching my sister “She’ll be a right babe when she grows up. Ooh what a bod!”.

She stood with her back to us, preparing for some exercise. Her body was tight and athletic. Broad shoulders tapered slightly to her waist and out to her curving hips. The leotard she wore was cut disgustingly high (I thought) and did nothing to hide her round tight buttocks, glutes hardened by years of competitive level gymnastics. “Cor what an arse. I wouldn’t mind getting up there” Superrod muttered. “That’s my kid sister you’re talking about!” I said. I looked back to see her bending over and touching her toes showing virtually all her buttocks atop her slender legs the backs of which were quite muscled. I had to admit the sight was sexy and felt aroused, reddening in embarrassment that my own kid sister could have this effect on me.

She straightened up and raised herself onto her toes. Her well toned calves exploded in solid diamonds of muscle. She lowered herself and turned sideways on to us and started limbering up her arms which rippled and swelled with muscles I didn’t know she had. I was shocked to see that the skin-tight Lycra was almost translucent showing clearly the outlines of small swellings of her young but maturing breasts with her nipples jutting out. It also showed her well developed abdominal muscles like an iron grid etched across the tight fabric of her leotard.

Raising her right leg she stretched it out in front of her at 90 degrees to her body keeping it straight all the time. “Great legs. I’d bet she’d look good in a mini skirt and high heels” Chris muttered. I had to agree, with her leg stretched out like that I noticed how shapely they were - sensuous curves along her calves, and the front and back of her thigh. Her outer thigh bulged that for a moment reminded me of Lady Helen and her leggy embrace.

Without touching it to the ground, she swung her leg right back, caught it with her hand and pulled it right up behind her back in a amazing display of suppleness. As she did this, I noticed the leg biceps at the back of her leg bulge large and strong. I felt my dick stiffen and brought myself out of my trance. What was I doing? ogling my kid sister!. I turned to the others “Come on let’s go”. They were transfixed, bulges very evident in their trousers!. “Come on let’s go” I repeated.

I looked at Jackie’s face and she smiled at me mischievously. “ooorrh look at that” Chris moaned as she lowered herself slowly to the ground doing the splits. The skin tight fabric of her leotard moulded itself into her slit. I couldn’t take my eyes of her crotch as she got lower and lower. With her back straight, her legs got wider and wider apart in an astonishing display of suppleness, balance, and control. “orrhhhh” we moaned.

Smiling sweetly she spoke in her soft childlike voice “Oh hi boys I didn’t see you standing there. I see you liked that, you’ll love this”. She placed her hands on the floor and raised her body until it was held aloft by her straight arms. She swung her legs forward, spread wide apart, presenting her crotch fully for us. “orrrh my god” I moaned, my erection becoming uncomfortable as it strained against my trousers.

Trying to look like little miss innocent she lowered herself to the ground and told us “glad you liked that. What about this?”. She turned her back to us and laid down. Slowly she raised her body and her long shapely well toned legs together in perfect unison until they pointed to the sky, supported only by the back of her neck and her arms. She spread her legs wide and slowly started to lower them until they were at right angles to her body, once again giving us full view of her barely covered crotch. She lowered her legs further, still spread wide until her feet almost touched the ground. Her legs forming an inverted V in front of her, her crotch openly on display not to mention her lovely tight buttocks.

“oooohhh gooddd” Chris moaned loudly, a wet patch spreading on the front of his trousers. He rushed into the house to clean himself up, face red with embarrassment. Superrod’s massive bulge after which he got his nickname was twitching in his trousers like a small tent. “Ohh God, Bobby, if only she was older” he too went into the house to relieve himself.

“Don’t you want to go to the bathroom too?” Jackie asked, all sweetness and light. I faced her. She was standing again. “I’m disgusted at the way you flaunt your body like that?” I told her. “Like what Bobby?. I don’t know what you mean?” she replied innocently.

“You know what I mean” I retorted. “Do mean this?” she said as she stood astride, raised herself on tiptoes and went into a semi-crouch. Each leg turned outwards from each other, her calves and inner thighs bulging drawing my attention to her wide open crotch fully presented to me through that near translucent leotard. It was more than I could bear “nnnngh nnngh nnnnghh” I shot my wad into my trousers in three massive spurts. Red-faced I entered the house to clean up, my not-so innocent little sister laughing behind me.

I emerged from the bathroom. Superrod and Chris were waiting. “Are we going or what?” Chris asked. “Yeah, I’ve just got to tell Jackie then we’re off” I replied as we went back downstairs. “Man, you’re sister needs a good seeing to” Superrod said. Shocked I told him “Leave off!, she’s my kid sister. She’s not even a proper teenager yet”. “Some kid sister” he replied as we entered the living room.

Jackie was sitting at the dining table sipping a can of drink. I walked over to her and told her “We’re just going out for a while, okay?”. “No it’s not okay. Mum said we were to stay in the house” she replied tartily. “Well tough, I’m off out” I snapped. “And I’ll tell mum” she said. “You do and you’re in dead trouble” I said getting angry, shaking my fist at her. “Ooooh I’m really scared. I’d make mincemeat out of you just like that upper class woman did to you” she sneered. “Sssh shut up about that. You don’t tell mum and dad that I’ve gone, right?” I told her. “Oh boys, want to know who really beat up Bobby?” she shouted. “Shut up kid!” I hissed angrily. “I’m not frightened of you. Let’s arm wrestle for it” she said out aloud.

“You what!” I said surprised. “You heard. Let’s arm wrestle. If you win, you can go out and I won’t say a word. If I win, then I can choose a forfeit for you. Agreed?” she said smiling sweetly. I was stunned, I didn’t know what to say - my own little sister seriously suggesting we arm wrestle!. Superrod said “come on Bobby get it over with and lets get out of here”. I looked at the tight bunched muscles in her arms from all that weight training she did, but what the hell, I’ll have no problem beating a girl “Yeah okay” I said confidently.

We cleared a place on the table. Due to its width we had to face each other diagonally across one corner. We brought our right arms together, elbows touching, wrists vertical and locked fists. Her hand was a bit smaller than mine and her arm was a bit shorter, so she had to put her left hand under her elbow so she could reach high enough. I was surprised at how firm her grip was. I looked at my sister’s oh so pretty face, for a moment getting lost in her lovely blue eyes. Superrod was right, she was turning into a real babe. She gave a little pout and then smiled sweetly “Ready to be beaten big brother?” she asked. “You don’t stand a chance” I replied.

We each drew a deep breath and began: This is going to be easy I thought to myself as I started to push against Jackie’s arm. However her arm was going nowhere. I could see the tendons in her wrist stand out as she withstood me as I tried to budge her. “You can start anytime you like” she said smiling as I strained against her. That pissed my off and I pushed with all my might. Still her arm did not move. Then it did move, but not in the direction I wanted!. Slowly she started to push my arm down. Straining hard, I tried to resist. I noticed how strong her forearm looked, slim at the wrists and wide at the base with veins popping out under the strain. Thick ridged bulges of muscle stretched the thin fabric of her leotard in a rather disturbing manner. “Going down” she said grinning at me.

I began to grunt and my arm trembled under the exertion. For a moment I managed to halt my arms’ downward progress at about 30 degrees from vertical. I tried to back her arm back, but it felt as if I was pushing against a iron bar. Straining with exertion she slowly began to push my struggling arm closer and closer to the table. No this wasn’t possible!, I couldn’t let this happen!, I couldn’t let my sister beat me in front of my friends. No matter how hard I tried, I could not stop the inevitable. With a final surge of power, she slammed the back of my hand into the table top. “Bobby! what the fuck!” exclaimed Chris. “Jeez man!” Superrod uttered.