Sister Sally pt 2

Our parents thought it was a phase, but I knew better. Sally didn’t stop hitting the gym. In fact, when our parents questioned why she wanted to do this to her body, it only made Sally want to work harder. It was almost like she got off on freaking them out.

She started eating more, especially meat and protein, and lifting heavier. Her 5’5” frame, just 3” shorter than mine, was becoming wider than mine. Now you should know I’m not just some skinny kid - I play running back on the football team and work out regularly, and our family are naturally mesomorphs. But Sally must have got far better genetics than me for building muscle because she was easily out-muscling me.

We were both in the weight room when I saw Sally pushing up 250lbs at the bench press. I could not believe my eyes. That was a weight I could barely squat. She sat up and shook her arms out. She wore tight lycra shorts that stuck to her thick quads like a second skin, and a sleeveless cut-off half shirt. My god, her arms were huge! Her biceps were peaked orange-sized bulges with thick, defined triceps. 

She noticed me staring at her, gave me a smile, and flexed her thick bicep. It rose, and the vein on top engorged to the width of a pencil. She winked at me. My dick started getting hard, so I got up and ran out of there.

Later that night, back at the house, she walked into my room and shut the door. She was wearing the same lycra shorts and sleeveless, cut-off top she had been wearing at the gym. 

“Hello, brother. I just got back from the gym,” she said casually. She dropped a small bag on my bed.

“Just got back?” I asked incredulously. “That was three hours ago!” 

“That’s right,” she replied. “You gotta put the time in to build all this beef, baby!” she said, puffing out her chest with a flex. My eyes widened as her top tightened over her thick pecs. Her small breasts had all but disappeared, replaced almost entirely by thick, man-shaming pecs. And she was proud of them.

I could feel my dick hardening again. I quickly sat at my desk and turned my back to her. “Get out of my room, Sally. I have homework to do.”

Sally chuckled, enjoying my embarrassment. “But I need your help,” she said in an almost sultry voice.

That voice plus the vision of her pecs bulging beneath that top made my hard on impossible to ignore. My face flushed.

“I’m serious Sally, get out!” I squeaked.

“No,” Sally replied. “Not until you turn around and face me.”

“Sally,” I said with some frustration.

“Come on, brother. Turn around and look at me,” she said.

I sighed, “Sally, please…”

“I said look at me!” Sally commanded. I turned my head.

She had her hands on her hips, and I could see those bulky traps that made her neck look so thick, bulbous, muscular arms encrusted with veins, quads bulging under the lycra of her shorts, and calves so big they could be seen from the front. 

She smiled and said, “Turn around!”

Then she started flexing into a most muscular. I couldn’t help myself. I slowly turned to get a better view. I saw her traps bulge, crawling up her neck, and her arms inflate with even more muscle and veins. Ripples traveled down her neck and disappeared beneath the top that seemed even tighter. I could see the bricks of her six-pack abs exposed where the top ended.

“You like it,” Sally said through grit teeth. “You’re hard as a rock!”

I flushed and looked down at my crotch, where my raging hard on was tenting my sweat pants. I gasped.

Sally chuckled, releasing her flex. “Turned on by your own sister!” she teased.

I looked back up at her, mouth agape.

“It’s okay big brother. It just shows that my body is so built, so hot that I can turn my own brother on! And that gets me hot!”

I was stunned silent.

“Go ahead. Take it out,” Sally said.

I was shocked. “Sally, no…”

She smiled and reached for the bottom of her shirt. She slowly lifted, revealing the thick brick work of her abs. For the first time, I could see her pecs in all their glory, huge, thick, and striated. She still had breasts, but they were tiny and hung from the corners of square, mannish pecs that were in the process of slowly consuming them.

She casually dropped her top on my floor. “Do it,” she commanded. “Pull out your cock and stroke it!”

Then she flexed her pecs, making them jump. It was so erotic that I couldn’t help myself. I grabbed my cock and stroked.

Sally giggled. “That’s it, brother,” she said in that sultry voice. “Jerk off to your sister!” 

Then she flexed again into a most muscular, veins and striated muscle bulging. Her pecs bloated with muscle, and her arms solidified into bulbous angular masses. 

My mouth dropped and I stroked faster. 

“Keep going, brother,” she said switching to a double bicep pose. “Keep masturbating to your sister’s thick, bulging muscles!”

Her biceps bulged obscenely as veins spider-webbed across both arms and around thick, horseshoe triceps and bloated, rippling delts. Then she reached out with her tongue and licked her bicep.

I couldn’t take it anymore and exploded, ejaculating all over myself.

Sally smiled. “Good boy. Now I need your help.”

I sat, totally embarrassed and humiliated. But Sally just unceremoniously grabbed the bag she had dropped on my bed and pulled out a syringe.

“I need you to inject me,” she said.

“Sally, what…” I said as I awkwardly stood, grabbed a tissue, and cleaned myself off.

“Do it. In my ass,” she said as she turned and pulled her lycra shorts off. Her ass was huge, rippling with muscle, and was so defined that she had two fist-sized indentations on the side of each cheek.

“But Sally, what is this?” I said picking up the syringe.

“What do you think it is? It’s what’s going to get me to the next level!” Sally replied impatiently.

“Sally, are these… steroids?” I stammered.

Sally sighed. “Look, I’ve been hitting plateaus in all my lifts. I need something more than just good genetics if I’m going to get bigger.”

“Bigger? Sally, you’re huge!” I said.

Sally chuckled. “I know. Like your wildest wet dream, right?” she said nonchalantly, standing there completely naked with no shame.

“Come on, bro,” she said in that sultry voice. “Don’t you want to see me get even bigger?!” she said, punctuating it with a flex that rippled through her thick musculature. It was so erotic it made by cock stir despite having ejaculated just moments ago.

I looked down at the syringe, looked back up at Sally, and nodded. She smiled and presented that thick ass to me. I stuck in the needle and squeezed it all into her.

“Oh yeah, bro, just you wait. I’m going to get even huger!”